Add and Subtraction Within 20

Free printable addition and subtraction within 20 worksheets: each page mixes both operations. Problems such as 8 plus 5 or 14 minus 6 sit side by side. Numbers stay within 20, and the page prints free with an answer key.

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See all the worksheet templates · Open the addition and subtraction worksheet generator

How to make your worksheet

  1. Open the addition and subtraction generator and set numbers to within 20.
  2. Choose a mix of problems so addition and subtraction both appear on the page.
  3. Print the sheet along with its answer key for quick checking after practice.
  4. Ask your child to read each problem aloud and say whether it needs adding or taking away.

Telling Addition and Subtraction Apart

Before solving, have your child find the sign in each problem and name it, plus or minus. A plus sign means two amounts join together, while a minus sign means one amount is taken away. Saying the sign first stops a child from guessing the wrong operation out of habit.

Adjusting the Difficulty

If mixed problems feel like too much at once, print a page of only addition first. Then try a separate page of only subtraction. Once each one feels steady on its own, go back to the mixed sheet. See how your child handles switching between the two. Pictures or a number line can also be added back in for extra support.

What Comes Next

Once addition and subtraction within 20 feel steady, move on to bigger numbers. Try the same mix with numbers within 50 or 100 next. Keeping both operations on one page, instead of separate drills, keeps your child reading each problem carefully. This stops a child from assuming every page is the same kind of problem.

Good questions

How to teach subtraction within 20?

To teach subtraction within 20, start with objects your child can touch and take away. Move to a number line next, hopping backward from the larger number. Once that feels steady, try the same problems with just numbers on paper.

How to teach addition and subtraction within 20?

To teach addition and subtraction within 20, keep the two side by side. This helps your child check the sign before solving each problem. A number line or ten frame can support both operations at once.

Make another kind of sheet

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