# Key Stage 1, Maths, Addition and Subtraction

Lesson 1

## The commutative Law of Addition using aggregation

Lesson 2

## The commutative Law of Addition using augmentation

Lesson 3

## Measures Contexts to Show the Commutative Law of Addition

Lesson 4

## Embedding Understanding of Equivalent Expressions

Lesson 5

## Ten can be partitioned into pairs of numbers that sum to ten

Lesson 6

## Reasoning with number bonds

Lesson 7

## Numbers that Sum to 10

Lesson 8

## Adding one

Lesson 9

## Subtracting one

Lesson 10

## Consecutive numbers

Lesson 11

## Adding two

Lesson 12

## Subtracting two

Lesson 13

## Adding and subtracting with 5 and 3 and with 6 and 3

Lesson 14

## Adding or subtracting Zero

Lesson 15