KS1 Maths textbook

Year 1 Adding and Subtracting within 20: lesson and practice

Strand Number
Level Year 1
Practice 89 questions with step-by-step solutions

National Curriculum for England, Key Stage 1 mathematics, Year 1. Content: Number bonds and related subtraction facts within 20, Add and subtract one-digit and two-digit numbers to 20, including zero, Doubles and near doubles, Make 10 to add, Find the difference, Missing number problems and one-step problems.

Open Year 1 chapter

By the end of this chapter you will be able to

Find pairs of numbers that make a total up to 20
Make 10 first, then add the rest
Work out doubles and near doubles
Add and take away within 20, counting on and back
Find how many more one group has than another
Find a missing number and solve one-step problems

You should already know

Adding and taking away within 10 (Chapter 2)
Counting on and back on a number line
Numbers to 20 (Chapter 4)

Where this leads

Numbers to 100 (Chapter 6)
Grouping and sharing (Chapter 9)

Lessons in this chapter

Read the whole chapter on one page (good for printing).

Practise with real exam questions

The DfE publishes the old KS1 tests, with mark schemes, for free. They are optional for schools now, so use them as extra practice.

KS1 Maths past papers