Addition is commutative. This means the order of the addends can be changed without changing the calculation or sum.

An equation is used to show that one number or calculation is equal to another.

The sum is the total after numbers are added together.

Numbers can be added in any order

Maths

In this unit pupils will be reviewing and securing previous knowledge of add 3 addends, understanding they can be added in any order, bridging through 10. In the future unit pupils will use known facts to find multiples of ten that compose 100  and use known facts to find complements to 100.

In the prior unit pupils learned to find 10 more or less than a 2-digit number. They added and subtracted 10 to/from a 2-digit number using number facts. In this unit pupils will be reviewing and securing previous knowledge of add 3 addends, understanding they can be added in any order, bridging through 10

Review strategies for adding and subtracting across 10

Which two calculations have the same sum as 4 + 3 + 1?

Alex has these 3 number cards. What is the most sensible order to add them to find the sum?

What is the missing addend in this equation? 

What number is missing from the equation? 

What addend is missing from the equation? 

Which equation is represented by the tens frame? 

What is the sum of the numbers in the bar model? 

What addend is missing from the bar model? 

Alex chooses 3 of the number cards and adds them together. Which 3 cards did he choose if he gets a sum of 14?

This lesson will soon be taken down.

Numbers can be added in any order

Lesson outcome