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1st Grade - Math - 1.OA - Operations and Algebraic Thinking 

Represent and solve problems involving addition and subtraction.
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1.OA.1
Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.
Web Games
Name that number 
Notebook Files:
Digital Depot
Five green and speckled frogs
gumball
Happy Heart Word Problems
Add and Subtract
New Touch Point
Pizza Factory
Story Problems 2
Story Problems 3
Story Problems
Subtraction Unit
Understanding Subtraction
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1.OA.2
Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g. by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.
Web Games
Word Problems 
Notebook Files:
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1.OA.3
Apply properties of operations as strategies to add and subtract.3Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition).Students need not use formal terms for these properties.
Web Games
Number Sentence 
Notebook Files:
Sums of 5
Swat at the facts

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1.OA.4
Understand subtraction as an unknown-addend problem. For example: subtract 10 – 8 by finding the number that makes 10 when added to 8.
Web Games
Minus Mission 
Notebook Files:
Everyday Math 6.4
Everyday Math
Thinking Maps in Math
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Add and subtract within 20.
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1.OA.5
Relate counting to addition and subtraction (e.g. by counting on 2 to add 2).
Web Games
Math Magician (currently not working)
​Bug Catcher
Houghton Mifflin Practice
How many under the shell?
Kayak Race
​
Number Line Fun
​Space Jumps

Submarine Pad
​
Notebook Files:
1 more 1 less
Add/Subtract on number line
Counters
Counting Game
Domino Math
Number Sense
Snowman Count up and down
Subtraction Unit
touch math






1.OA.6
Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g. 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g. 13 - 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g. adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).
Web Games
Calculation Balance
Notebook Files:
Addition is a snap
Apple tree Subtraction
Ladybug Addition
Three Dice
Story Problems
Subtraction Unit

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Work with addition and subtraction equations

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1.OA.7
Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 – 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2. 
Web Games
Balance
Notebook Files:
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1.0A.8
Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = ___ - 3, 6 + 6 = ___.
Web Games
Stop the clock 
Notebook Files:
Everyday Math 6.1
Addition and Subtraction
Everyday Math 6.8
Story Problems
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