# Key Stage 1, Maths

Addition and subtraction within 20

## Lessons in this unit

Lesson 1

## To add by counting on using a number line

Lesson 2

## To subtract by counting back using a number line

Lesson 3

## To add a 1-digit number to a teens number using a known fact

Lesson 4

## To subtract a 1-digit number from a teens number using a known fact

Lesson 5

## To use the 'Make ten' strategy to add two 1-digit numbers (Part 1)

Lesson 6

## To use the 'Make ten' strategy to add two 1-digit numbers (Part 2)

Lesson 7

## To use the 'Make ten' strategy to subtract a 1-digit number from a teen number (Part 1)

Lesson 8

## To use the 'Make ten' strategy to subtract a 1-digit number from a teen number (Part 2)

Lesson 9

## To use mathematical models and strategies for addition

Lesson 10