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 total when numbers are added together.

Add three addends efficiently using a range of strategies

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

How would you find the sum of these calculations? Match them to the strategy you would use. 

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

Match up the equations to the correct sum. 

What is the missing addend in the bar model? 

Which calculations could be used to make this equation correct? 

What addend is missing from the bar model? 

The missing numbers from this bar model both have the same value. What are both numbers? 

This lesson will soon be taken down.

Add three addends efficiently using a range of strategies

Lesson outcome