Addition and Subtraction/Fact Power!
Unit Review Sheet
These facts and definitions should be mastered throughout this unit. This page can be used for periodic review and study as you are finishing the unit and in the future.
Facts and Definitions
Lesson 1: Using Arrays to Add
- Array: an ordered arrangement of objects
Lesson 2: So Many More Ways to Add
- Addend: a number that is added to another number
- Sum: the whole amount when two or more numbers are added together
- Commutative property of addition: math law that says that the order of numbers doesn't matter when adding; a+b=b+a
Lesson 3: Problem Solving with Addition
- Clue words: words that help us know whether to add or subtract
Lesson 4: Time to Subtract!
- Difference: the difference between two numbers when subtracting; what you get when you subtract two numbers
- Minuend: the first number in a subtraction sentence
- Subtrahend: the second number in a subtraction sentence
Lesson 5: Problem Solving with Subtraction
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Lesson 6: Tricks to Build Fact Power
- Identity or zero property of addition and subtraction: math law that states that adding zero to a number or subtracting zero from a number doesn't change the number
Lesson 7: Another Trick: Fact Families
- Fact family: a group of 3 numbers that can be combined to create number sentences
Lesson 8: Adding and Subtracting to Solve Problems
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Final Project: Mathematical Ocean Adventure
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