Subtraction within 20 worksheets
Aligned with Common Core 1.OA.C.6
Printable subtraction worksheets with numbers up to 20: taking away from double ten frames, hopping back on a number line, thinking addition, and then fact practice.
The worksheets
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Subtraction to 20 Chart
Four ways to subtract within 20: take back to 10, hop back, think addition and count up.
Take Away with Ten Frames
Teen numbers shown on two ten frames. Cross out dots to take away, then count what is left.
Hop Back to 20
A 0 to 20 number line for each problem. Start on the big number and hop back.
Think Addition
Each subtraction fact is paired with an addition fact that has a missing number, so kids can count up.
Subtraction Facts to 20 (Stacked)
Sixteen subtraction facts from numbers up to 20, written top to bottom.
Subtraction Facts to 20 (In a Row)
Sixteen subtraction facts from numbers up to 20, written across the page.
Print the whole packet
One copy of every sheet above, in order. Tap + for more copies (up to 10).
For the parent or teacher
What it is
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.
What comes next
Fact families and missing numbers, which tie addition and subtraction together.
How to teach it
- Use two ten frames, or 20 small things lined up in rows of 10, so kids can see the 10 inside a teen number.
- Hop back on a number line. Start on the big number and count the hops, not the starting spot.
- Think addition. For 13 - 8, ask "8 plus what makes 13?" and count up.
- Take back to 10. For 14 - 6, take 4 to get to 10, then 2 more to get to 8.
Common mistakes
- 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.