Grade 1 Math

Addition to 20

Addition to 20 helps children practise adding numbers with totals up to 20, including some sums that cross 10. Read the short guide, solve one task online, and print a worksheet for extra repetition.

How to solve this

  • Look for a way to make 10.
  • If the sum does not cross 10, count on normally.
  • If it crosses 10, split the second number into two parts.

Examples

7 + 6 = ?

13

9 + 4 = ?

13

What children practice

  • sums within 20
  • making 10 as a strategy
  • working with and without crossing 10

Practice online

Try one short exercise in the browser.

Printable worksheet

Create a fresh printable worksheet with an answer key for extra practice on paper.

Related topics

Back to Grade 1 Math Previous topic: Numbers to 20 Next topic: Subtraction to 20
Subtraction to 20Mixed Addition and Subtraction to 20Numbers to 20

FAQ

What should children know before addition to 20?

It helps if children are already comfortable with addition to 10 and numbers to 20.

What can we do if addition to 20 feels hard?

Make 10 first when you can. For 8 + 5, think 8 + 2 = 10 and then add 3 more.

How much practice is enough?

A short round of 5 to 10 minutes is usually enough for first graders. Stop while the child is still focused.