Number bonds to 20 worksheet

What's included?

PDF worksheets

Key Stage

KS1

Age

Years 1-2

Subjects

Maths

This free printable number bonds to 20 worksheet is perfect for KS1 teachers looking to build students’ maths fluency.

First, children need to work out how many blue bricks and how many yellow bricks there are in the tens frames. They can then use these amounts to write number sentences adding up to 20. For example:

There are 2 yellow bricks. There are 18 yellow bricks. Altogether there are 20 bricks.

2 + 18 = 20

18 + 2 = 20

You can use this number bonds to 20 worksheet in many ways, whether as part of a whole-class lesson, in small groups or during one-to-one support. The colourful design makes it appealing and helps pupils focus on the activity.

Pairing pupils can encourage teamwork, as they share strategies and discuss their thinking. For a hands-on option, provide manipulatives like counters or cubes to help visualise their work before writing answers.

You could laminate the sheets to make them reusable or use them as quick-fire warm-ups at the start of a maths session.

Number bonds

Number bonds to 20 are a fundamental concept in early maths, helping children understand the relationship between numbers.

They are pairs of numbers that add together to make 20, such as 10 + 10, 15 + 5, or 8 + 12. Mastering these bonds builds fluency in addition and subtraction, forming the basis for more advanced calculations.

Visual tools like counters and number lines can support pupils in recognising patterns and developing mental maths skills.

By practising regularly, children gain confidence and speed in their arithmetic, which supports problem-solving and broader mathematical understanding.

Learning number bonds to 20 also encourages children to spot connections between numbers, fostering a deeper understanding of place value and number relationships.

Mrs Mactivity is an early years and primary learning resources site, with new resources uploaded every week. Browse more number bonds games and worksheets.