Subtraction Facts to 20 (In a Row)
Subtract. Write your answer in the blue boxes.
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This is sheet #12124601.
How to do it
- Read the problem from left to right.
- Take away the second number.
- Write the answer in the blue box.
Teaching tip
Check an answer by adding it back. If 15 - 7 = 8, then 8 + 7 should make 15. This sheet is aligned with Common Core 1.OA.C.6.
About this worksheet
Sixteen subtraction facts from numbers up to 20, written across the page.
What kids practice
Subtraction within 20 means taking away from a number that is 20 or less, like 15 - 7. These facts are harder than the ones within 10 because kids can't see them on two hands. Ten frames, number lines and addition facts they already know are what make them easy.
Watch for
- Counting the starting number as the first hop, which gives an answer one too small.
- Taking the smaller ones digit from the bigger one (13 - 5 becomes 12, because 5 - 3 = 2).
- Losing track while counting back a long way. Counting up from the small number is usually shorter.
It's free to print, with Fewer, Standard or More on the page and an answer key. See the full subtraction within 20 guide for 1st grade.
More sheets in this set
- See it all
1. Subtraction to 20 ChartFour ways to subtract within 20: take back to 10, hop back, think addition and count up. 
2. Take Away with Ten FramesTeen numbers shown on two ten frames. Cross out dots to take away, then count what is left.
3. Hop Back to 20A 0 to 20 number line for each problem. Start on the big number and hop back.
4. Think AdditionEach subtraction fact is paired with an addition fact that has a missing number, so kids can count up.
5. Subtraction Facts to 20 (Stacked)Sixteen subtraction facts from numbers up to 20, written top to bottom.