# Horizontal Subtraction to 20

Click on the image to view the PDF.  Print the PDF to use the worksheet.

Horizontal Subtraction to 20

Practice 45 basic subtraction math facts. This worksheet practices subtraction math facts horizontally. The answer key is provided to check answers.

1st, 2nd

Looking for a fun coloring page to practice this math concept? Find it at Coloring Squared- Click Here

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 = ?.

[/tippy]

Operations And Algebraic Thinking

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.

[/tippy]