Educational quiz app · Ages 5-10

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Maths · Missing-number worksheet

Number Bonds to 20 Worksheet: Free Year 2 Maths with Answers

This free, printable worksheet helps children practise number bonds to 20: pairs of numbers that add up to 20, such as 13 and 7. Children fill in the missing number in each sum, then use their bonds to take away from 20.

It prints on one A4 page, and the answers print on a second page for grown-ups.

Years 1–2 · ages 5–7KS1Free to printFree to shareSheet 58

What your child is learning

‘recall and use addition and subtraction facts to 20 fluently, and derive and use related facts up to 100’

Year 2 Maths: Number – addition and subtraction, National Curriculum in England. Source and licence

Number Bonds to 20

Free Maths worksheet · Ages 6 to 7

Name:

A cheerful cartoon squirrel pointing at a row of round beads on a string, drawn as black outlines on white for colouring in.

Find the missing number

Each pair of numbers makes 20. Write the missing number in the box.

1.11 + = 20
2.6 + = 20
3.20 + = 20
4.4 + = 20
5.7 + = 20
6.19 + = 20
7.18 + = 20
8.15 + = 20
9.10 + = 20
10.12 + = 20
11.17 + = 20
12.9 + = 20

Which number comes first?

Write the number that goes with the other one to make 20.

1. + 3 = 20
2. + 9 = 20
3. + 11 = 20
4. + 16 = 20
5. + 13 = 20
6. + 7 = 20

Take away from 20

Use your number bonds to answer these take-away sums.

1.20 − 17 =
2.20 − 4 =
3.20 − 0 =
4.20 − 8 =
5.20 − 16 =
6.20 − 6 =

Answers: Number Bonds to 20

Sheet 58

11 + 9 = 20
6 + 14 = 20
20 + 0 = 20
4 + 16 = 20
7 + 13 = 20
19 + 1 = 20
18 + 2 = 20
15 + 5 = 20
10 + 10 = 20
12 + 8 = 20
17 + 3 = 20
9 + 11 = 20
17 + 3 = 20
11 + 9 = 20
9 + 11 = 20
4 + 16 = 20
7 + 13 = 20
13 + 7 = 20
20 − 17 = 3
20 − 4 = 16
20 − 0 = 20
20 − 8 = 12
20 − 16 = 4
20 − 6 = 14

For grown-ups. Free worksheets and the Owee quiz app at owee.world

Answer key

11 + 9 = 20
6 + 14 = 20
20 + 0 = 20
4 + 16 = 20
7 + 13 = 20
19 + 1 = 20
18 + 2 = 20
15 + 5 = 20
10 + 10 = 20
12 + 8 = 20
17 + 3 = 20
9 + 11 = 20
17 + 3 = 20
11 + 9 = 20
9 + 11 = 20
4 + 16 = 20
7 + 13 = 20
13 + 7 = 20
20 − 17 = 3
20 − 4 = 16
20 − 0 = 20
20 − 8 = 12
20 − 16 = 4
20 − 6 = 14

What are number bonds to 20?

Number bonds are pairs of numbers that make a total. Number bonds to 20 are the pairs that add up to 20: 0 and 20, 1 and 19, 2 and 18, and so on up to 10 and 10. Children who know their number bonds to 10 can use them here. If 3 and 7 make 10, then 13 and 7 make 20.

How to help at home

Start with the bonds your child already knows to 10 and show how each one grows to 20. Count out twenty small things, such as pasta pieces, and split them into two groups. Say each pair out loud: fourteen and six make twenty. Then try the sheet together, and check the answers on page 2.

Why it matters

In Year 2, children are expected to recall addition and subtraction facts to 20 quickly and without counting. That quick recall makes later mental maths, column methods and money problems much easier.

Frequently asked questions

What year group learns number bonds to 20?

Children meet number bonds within 20 in Year 1 and are expected to recall them fluently in Year 2, when they are 6 to 7. The sheet also works well as a Year 3 warm-up.

Is there an answer sheet?

Yes. The answers print on a second page, so you can check your child's work quickly. On screen, open the answer key under the worksheet.

Is this worksheet really free?

Yes. Print it, save it as a PDF or share it with other parents and teachers. There is no sign-up and no email needed.

Curriculum links

Year 2 Maths: Number – addition and subtraction (statutory): 'recall and use addition and subtraction facts to 20 fluently, and derive and use related facts up to 100'
Year 1 Maths: Number – addition and subtraction (statutory): 'represent and use number bonds and related subtraction facts within 20'

Quoted word for word from Department for Education documents: the National Curriculum in England, the EYFS framework or the RSHE guidance. Contains public sector information licensed under the Open Government Licence v3.0.

Made by The Owee education team. Updated 13/10/2026. Free to print and share.