# Addition Facts to 20

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Addition Facts to 20

Practice basic addition math facts. Learn adding to 20 using this page. The answer key is provided to check answers.

1st, 2nd

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Common Core Standards

1.OA.3

Operations And Algebraic Thinking Understand
Apply Properties Of Operations And The Relationship Between Addition And Subtraction.

Apply properties of operations as strategies to add and subtract.3 Examples: 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.)

1.OA.8

Operations And Algebraic Thinking
Work With Addition And Subtraction Equations.

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 = ?.

2nd Grade – 2.OA.2

Operations And Algebraic Thinking
Add And Subtract Within 20.

Fluently add and subtract within 20 using mental strategies.2 By end of Grade 2, know from memory all sums of two one-digit numbers.