7th Grade Math 3A-3A Assignments
- Instructors
- Matthew Manciero
- Mrs. Nikky D'Antonio
- Term
- 2023-2024 School Year
- Department
- Math
- Description
-
Upcoming Assignments
No upcoming assignments.
Past Assignments
Due:
Moby Max Week 1/19-1/25
Go to Moby Max and complete the assignment labeled,
"Week 1/19-1/25".
The lessons in this assignment are:
1. Compare theoretical probability and experimental probability
2. Calculate experimental probability word problems
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
"Week 1/19-1/25".
The lessons in this assignment are:
1. Compare theoretical probability and experimental probability
2. Calculate experimental probability word problems
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
Due:
3.4 Distributive Property
Complete the bottom section from the Fraction, Decimal and Negatives worksheet from the packet that was given in class.
Due:
Moby Max Week 1/12-1/18
Go to Moby Max and complete the assignment labeled,
"Week 1/12-1/18".
The lessons in this assignment are:
1.Calculate experimental probability Part 1
2. Calculate experimental probability Part 2
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
"Week 1/12-1/18".
The lessons in this assignment are:
1.Calculate experimental probability Part 1
2. Calculate experimental probability Part 2
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
Due:
Moby Max Week 1/12-1/18
Go to Moby Max and complete the assignment labeled,
"Week 1/12-1/18".
The lessons in this assignment are:
1.Calculate experimental probability Part 1
2. Calculate experimental probability Part 2
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
"Week 1/12-1/18".
The lessons in this assignment are:
1.Calculate experimental probability Part 1
2. Calculate experimental probability Part 2
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
Due:
3.3 Simplifying Expressions Packet
Complete the 3.3 Simplifying packet EVENS ONLY.
Due:
3.3 Simplifying Expressions Packet
Complete the 3.3 Simplifying packet EVENS ONLY.
Due:
Moby Max Week 1/5-1/11
Go to Moby Max and complete the assignment labeled,
"Week 1/5-1/11".
The lessons in this assignment are:
1.
Calculate theoretical probability with decimals
2. Calculate the probability of opposite events
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
"Week 1/5-1/11".
The lessons in this assignment are:
1.
Calculate theoretical probability with decimals
2. Calculate the probability of opposite events
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
Due:
3.1-3.2 Adding and Subtracting Like Terms
Complete the 3.1-3.2 Worksheet that was given in class.
Due:
3.1-3.2 Adding and Subtracting Like Terms
Complete the 3.1-3.2 Worksheet that was given in class.
Due:
3.0 Recall Prior Knowledge
Complete the first 3 pages of the packet that was given in class.
Due:
Moby Max Week 12/15-12/21
Go to Moby Max and complete the assignment labeled,
"Week 12/15-12/21".
The lessons in this assignment are:
1. Determine desired outcomes
2. Calculate theoretical probability with fractions
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
"Week 12/15-12/21".
The lessons in this assignment are:
1. Determine desired outcomes
2. Calculate theoretical probability with fractions
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
Due:
Study Guide #2 Answer Key
Here is the answer key for the second study guide for those who did it! Check your answers before tomorrow for the test and if needed come ask me questions during Study Hall!
Due:
Study Guide #1 Answer Key
Here is the Study Guide for Study Guide #1. Check your answers before tomorrow!
Due:
Study Guide #2 Answer Key
Here is the answer key for the second study guide for those who did it! Check your answers before tomorrow for the test and if needed come ask me questions during Study Hall!
Due:
Study Guide #1 Answer Key
Here is the Study Guide for Study Guide #1. Check your answers before tomorrow!
Due:
2.5 + 2.6 Order of Operations
Complete the 2.5 and 2.6 Order of Operations with Rational Numbers worksheet that was given in class, here is a copy if you loose it.
Due:
2.5 + 2.6 Order of Operations
Complete the 2.5 and 2.6 Order of Operations with Rational Numbers worksheet that was given in class, here is a copy if you loose it.
Due:
Moby Max Week 12/8-12/14
Go to Moby Max and complete the assignment labeled,
"Week 12/8-12/14".
The lessons in this assignment are:
1. Understand probability
2. Determine possible outcomes
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
"Week 12/8-12/14".
The lessons in this assignment are:
1. Understand probability
2. Determine possible outcomes
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
Due:
Moby Max Week 12/8-12/14
Go to Moby Max and complete the assignment labeled,
"Week 12/8-12/14".
The lessons in this assignment are:
1. Understand probability
2. Determine possible outcomes
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
"Week 12/8-12/14".
The lessons in this assignment are:
1. Understand probability
2. Determine possible outcomes
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
Due:
2.6 Word Problems/Pixel Art
Complete the decimal word problem packet 21-26 and 35 or 29 from the challenge and complete ONE of the two pixel arts do the one you are struggling with to make sure you get more practice.
**If you do BOTH pixel arts and the word problems you get a Life Saver***
**If you do BOTH pixel arts and the word problems you get a Life Saver***
Due:
2.5 Word Problems/Pixel Art
Complete the first 3 problems from the word problem packet and complete ONE of the two pixel arts from todays class they are under "classwork". Do the one you are struggling with to make sure you get more practice.
**If you do BOTH pixel arts and the word problems you get a Life Saver***
**If you do BOTH pixel arts and the word problems you get a Life Saver***
Due:
Operations with Fractions
Due:
Moby Max Week 12/1-12/7
Go to Moby Max and complete the assignment labeled, "Week 12/1-12/7".
The lessons in this assignment are:
1.
Interpret box and whisker plots
2.
Calculate box and whisker plots
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
The lessons in this assignment are:
1.
Interpret box and whisker plots
2.
Calculate box and whisker plots
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
Due:
2.5+ 2.6 Multiplication and Division Decimal S
Complete the back of 2.5 + 2.6 Multiplication and Division Rational Numbers ONLY THE DECIMAL SIDE.
Due:
2.5+ 2.6 Multiplication and Division Decimal S
Complete the back of 2.5 + 2.6 Multiplication and Division Rational Numbers ONLY THE DECIMAL SIDE.
Due:
2.4 Order of Operations
Complete the Section 2.4 Order of Operation worksheet. (1-6) PEMDAS
Due:
2.4 Order of Operations
Complete the Section 2.4 Order of Operation worksheet. (1-6) PEMDAS
Due:
PEMDAS games
https://www.abcya.com/games/order_of_operations
https://www.math-play.com/Order-of-Operations-Millionaire/order-of-operations-millionaire-game_html5.html
https://mrnussbaum.com/order-ops-online-game#google_vignette
https://www.math-play.com/Order-of-Operations-Millionaire/order-of-operations-millionaire-game_html5.html
https://mrnussbaum.com/order-ops-online-game#google_vignette
Due:
PEMDAS games
https://www.abcya.com/games/order_of_operations
https://www.math-play.com/Order-of-Operations-Millionaire/order-of-operations-millionaire-game_html5.html
https://mrnussbaum.com/order-ops-online-game#google_vignette
https://www.math-play.com/Order-of-Operations-Millionaire/order-of-operations-millionaire-game_html5.html
https://mrnussbaum.com/order-ops-online-game#google_vignette
Due:
Moby Max Week 11/13-11/21
Go to Moby Max and complete the assignment labeled, "Week 11/13-11/21".
The lessons in this assignment are:
1. Calculate and interpret mean
2. Calculate and interpret median
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
The lessons in this assignment are:
1. Calculate and interpret mean
2. Calculate and interpret median
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
Due:
Moby Max Week 11/13-11/21
Go to Moby Max and complete the assignment labeled, "Week 11/13-11/21".
The lessons in this assignment are:
1. Calculate and interpret mean
2. Calculate and interpret median
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
The lessons in this assignment are:
1. Calculate and interpret mean
2. Calculate and interpret median
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE. NOT THE NIGHT IT IS DUE.*
Due:
2.4 Order of Operations
Complete the ODDS on page 97 of your textbook, a copy of the paper was given to you in class.
Due:
2.5 PEMDAS Worksheet
Complete the Order of Operations worksheet that was given in class, EVENS ONLY!
Due:
All operations + Word Problem Worksheet
Complete the worksheet that was given in class, it is to help you with your Integer Quiz on Wednesday !
Due:
All Operations Worksheet
Complete the back side of 2.3 Word Problems worksheet that was given in class ONLY. and the back with all the integer operation problems.
Due:
All Operations Worksheet
Complete the back side of 2.3 Word Problems worksheet that was given in class ONLY. and the back with all the integer operation problems.
Due:
Moby Max Week 11/3-11/9
Go to Moby Max and complete the assignment labeled, "Week 11/3-11/9".
The lessons in this assignment are:
1. Calculate median
2. Determine mode
3. Calculate range
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
The lessons in this assignment are:
1. Calculate median
2. Determine mode
3. Calculate range
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
Due:
Moby Max Week 11/3-11/9
Go to Moby Max and complete the assignment labeled, "Week 11/3-11/9".
The lessons in this assignment are:
1. Calculate median
2. Determine mode
3. Calculate range
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
The lessons in this assignment are:
1. Calculate median
2. Determine mode
3. Calculate range
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
Due:
Station Work
Unfished station work. Finish any unfinished station work.
Due:
Moby Max Week 10/27-11/2
Go to Moby Max and complete the assignment labeled, "Week 10/27-11/2".
The lessons in this assignment are:
1. Identify statistical questions
2.
Interpret histograms
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
The lessons in this assignment are:
1. Identify statistical questions
2.
Interpret histograms
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
Due:
2.2 Word Problems
Complete 2.2 Subtraction Word Problems that was given in class.
Due:
Moby Max Week 10/20-10/26
Go to Moby Max and complete the assignment labeled, "Week 10/20-10/26".
The lessons in this assignment are:
1.
Identify statistical questions
2.
Interpret dot plots
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
The lessons in this assignment are:
1.
Identify statistical questions
2.
Interpret dot plots
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
Due:
Moby Max Week 10/20-10/26
Go to Moby Max and complete the assignment labeled, "Week 10/20-10/26".
The lessons in this assignment are:
1.
Identify statistical questions
2.
Interpret dot plots
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
The lessons in this assignment are:
1.
Identify statistical questions
2.
Interpret dot plots
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
Due:
2.1+2.2 Addition and Subtraction of Integers Worksheet
Complete the worksheet that was given in class today, it has both the Halloween Maze, and the coloring of flags.
Due:
2.1+2.2 Addition and Subtraction of Integers Worksheet
Complete the worksheet that was given in class today, it has both the Halloween Maze, and the coloring of flags.
Due:
2.2 Subtracting Pixel Art
Due:
2.2 Subtracting Integers
Complete the Subtraction of integer HW, that was given in class. If you did not complete the Pixel art from classwork complete that also.
Due:
2.2 Subtracting Integers on Number Line
Complete the subtracting on number lines packet that was given in class.
Due:
2.2 Subtracting Integers on Number Line
Complete the subtracting on number lines packet that was given in class.
Due:
Moby Max Week 10/13-10/19
Go to Moby Max and complete the assignment labeled, "Week 10/13-10/19".
The lessons in this assignment are:
1. Calculate volume
2. Calculate volume word problems
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
The lessons in this assignment are:
1. Calculate volume
2. Calculate volume word problems
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
Due:
Moby Max Week 10/13-10/19
Go to Moby Max and complete the assignment labeled, "Week 10/13-10/19".
The lessons in this assignment are:
1. Calculate volume
2. Calculate volume word problems
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
The lessons in this assignment are:
1. Calculate volume
2. Calculate volume word problems
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
Due:
2.1 Adding Word Problems
Complete the Adding Word Problem Packet. #1-10 MUST be completed, 11&12 are a challenge, try them!
Due:
2.1 Adding Word Problems
Complete the Adding Word Problem Packet. #1-10 MUST be completed, 11&12 are a challenge, try them!
Due:
2.1 Adding Integer Worksheet
Complete the double sided worksheet that was given in class.
Due:
2.1 Adding Integer Worksheet
Complete the double sided worksheet that was given in class.
Due:
2.1 Adding Integers
Due:
2.1 Adding Integers
Due:
2.1 Adding Integers with Chips
Complete the Adding Integer with Chips worksheet that was started in class.
Due:
Moby Max Week 10/6- 10/12
Go to Moby Max and complete the assignment labeled, "Week 10/6-10/12".
The lessons in this assignment are:
1.
Calculate surface area for rectangular prisms
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
The lessons in this assignment are:
1.
Calculate surface area for rectangular prisms
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
Due:
Moby Max Week 10/6- 10/12
Go to Moby Max and complete the assignment labeled, "Week 10/6-10/12".
The lessons in this assignment are:
1.
Calculate surface area for rectangular prisms
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
The lessons in this assignment are:
1.
Calculate surface area for rectangular prisms
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
Due:
2.1 Number Lines Adding Integers
Complete the Number Line packet that was given in class.
Due:
2.1 Number Lines Adding Integers
Complete the Number Line packet that was given in class.
Due:
Moby Max Week 9/29-10/5
Go to Moby Max and complete the assignment labeled, "Week 9/29-10/5".
The lessons in this assignment are:
1. Calculate area for composite figures
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
The lessons in this assignment are:
1. Calculate area for composite figures
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
Due:
Study Guide 2
Complete Study Guide 2. Answer key will to double check your answers, will be posted Tuesday night by 6:00 PM
Due:
Study Guide 2
Complete Study Guide 2. Answer key will to double check your answers, will be posted Tuesday night by 6:00 PM
Due:
Study Guide #2 Key
Check your answers.
Due:
Study Guide #2 Key
Check your answers.
Due:
Study Guide 1
Complete as much as you can of Study Guide 1 that was given in class today. Make sure you come to the next class ready to ask questions on problems you still may confused on.
Due:
Moby Max Week 9/22 - 9/28
Go to Moby Max and complete the assignment labeled, "Week 9/22-9/28".
The lessons in this assignment are:
1. Find the area of a rectangle with fractional lengths
2. Represent 3D figures with nets
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
The lessons in this assignment are:
1. Find the area of a rectangle with fractional lengths
2. Represent 3D figures with nets
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
Due:
1.2 Day 2 Repeating Decimals and Comparing
Complete the 1.2 Repeating Decimals and Comparing #1-8 that was given in class, if you lost it here it is online.
Due:
1.2 Day 2 Repeating Decimals and Comparing
Complete the 1.2 Repeating Decimals and Comparing #1-8 that was given in class, if you lost it here it is online.
Due:
1.2 Terminating Decimals
Complete 1.2 Day 1 Terminating Decimals packet that was given in class.
Due:
Moby Max Week 9/15 - 9/21
Go to Moby Max and complete the assignment labeled, "Week 9/15-9/21".
The lessons in this assignment are:
1. Find the area of a trapezoid
2. Find the area of a trapezoid 2
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
The lessons in this assignment are:
1. Find the area of a trapezoid
2. Find the area of a trapezoid 2
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
Due:
1.1 Number Lines
Complete the Number Line worksheet.
Due:
1.1 Number Lines
Complete the Number Line worksheet.
Due:
1.1 Decimals to M/N form
Complete the worksheet that was given in class on changing decimals to m/n form.
Due:
Moby Max Week 9/8-9/14
Go to Moby Max and complete the assignment labeled, "Week 9/8-9/14".
The lessons in this assignment are:
1. Find the area of a triangle.
2. Find the area of a parallelogram
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
The lessons in this assignment are:
1. Find the area of a triangle.
2. Find the area of a parallelogram
5pts each lesson
70% or higher- 5
Lower than 70%- 3
No completion- 0%
*If you are not pleased with your score, email me to reassign the lessons BEFORE Thursday. NOT THE NIGHT IT IS DUE.*
Due:
1.1 The Real Number System Worksheet
Complete #1-12, #13-18 challenge.
Due:
Review Worksheets
Complete the worksheet that was given in class, both sides. It is on Mixed Numbers and Improper Fractions and Adding and Subtracting Fractions with like Denominators.