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Maths · Missing-number worksheet

Number Bonds to 100 Worksheet: Free Year 2 Maths with Answers

This free, printable worksheet helps children learn number bonds to 100. It starts with tens, such as 30 and 70. Then it moves on to pairs like 46 and 54, and ends with take-away questions from 100.

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

Years 2–3 · ages 6–8KS1Free to printFree to shareSheet 57

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 100

Free Maths worksheet · Ages 6 to 7

Name:

A cartoon pig dropping coins into a glass jar, drawn as black outlines on white for colouring in.

Tens to 100

Each pair of tens makes 100. Write the missing number.

1.80 + = 100
2.60 + = 100
3.10 + = 100
4.40 + = 100
5.70 + = 100
6.30 + = 100
7.50 + = 100
8.90 + = 100
9.20 + = 100

Any number to 100

The ones make 10 and the tens make 90. Write the missing number.

1.67 + = 100
2.19 + = 100
3.64 + = 100
4.79 + = 100
5.43 + = 100
6.29 + = 100
7. + 65 = 100
8. + 38 = 100
9. + 53 = 100

Take away from 100

Use your number bonds to answer these.

1.100 − 33 =
2.100 − 10 =
3.100 − 66 =
4.100 − 20 =
5.100 − 13 =
6.100 − 70 =

Answers: Number Bonds to 100

Sheet 57

80 + 20 = 100
60 + 40 = 100
10 + 90 = 100
40 + 60 = 100
70 + 30 = 100
30 + 70 = 100
50 + 50 = 100
90 + 10 = 100
20 + 80 = 100
67 + 33 = 100
19 + 81 = 100
64 + 36 = 100
79 + 21 = 100
43 + 57 = 100
29 + 71 = 100
35 + 65 = 100
62 + 38 = 100
47 + 53 = 100
100 − 33 = 67
100 − 10 = 90
100 − 66 = 34
100 − 20 = 80
100 − 13 = 87
100 − 70 = 30

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Answer key

80 + 20 = 100
60 + 40 = 100
10 + 90 = 100
40 + 60 = 100
70 + 30 = 100
30 + 70 = 100
50 + 50 = 100
90 + 10 = 100
20 + 80 = 100
67 + 33 = 100
19 + 81 = 100
64 + 36 = 100
79 + 21 = 100
43 + 57 = 100
29 + 71 = 100
35 + 65 = 100
62 + 38 = 100
47 + 53 = 100
100 − 33 = 67
100 − 10 = 90
100 − 66 = 34
100 − 20 = 80
100 − 13 = 87
100 − 70 = 30

From bonds to 10 to bonds to 100

If 3 and 7 make 10, then 30 and 70 make 100. That is why the first part of the sheet uses tens only. For other numbers, look at the ones first: they make 10. Then the tens make 90, not 100, because the extra ten comes from the ones. So 46 needs 54: 6 and 4 make 10, and 40 and 50 make 90.

How to help at home

A £1 coin is worth 100p, so money is a good way to practise. Put out 35p and ask how much more makes £1. A tape measure works too. 100 centimetres make 1 metre, so cover the first 62 centimetres with your hand and ask how many are left.

Why it matters

In Year 2, children use the facts they know to 20 to work out related facts up to 100. Bonds to 100 are among the most useful of these. They help with change from £1, and with adding and taking away 2-digit numbers in their heads.

Frequently asked questions

What year group learns number bonds to 100?

Year 2, in the National Curriculum in England, when children are 6 to 7. They start with multiples of 10, like 40 + 60. Pairs like 37 + 63 take longer, and Year 3 is a good time to keep practising them.

Why do the tens add up to 90, not 100?

Because the ones make another 10. In 37 + 63, the 7 and 3 make 10, and 30 and 60 make 90, so the total is 100. Children who make the tens add up to 100 give answers like 73 instead of 63, so this is a common slip.

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 2 Maths: Number – addition and subtraction (statutory): 'recognise and use the inverse relationship between addition and subtraction and use this to check calculations and solve missing number problems'

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.