Bridging is a mental strategy which uses addition or subtraction to cross a number boundary.

Partition means splitting a number into parts.

Addition by bridging through 10

Maths

Add 3 numbers together using doubles and near doubles

Add 3 numbers together in different contexts

Numbers can be added in any order

Add three addends by finding pairs that total 10

Add three addends efficiently using a range of strategies

Subtracting small numbers

Subtracting to and from 10

Subtracting numbers that bridge through 10

Solving problems involving addition and subtraction

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 adding 3 addends, understanding they can be added in any order, bridging through 10.

In this unit pupils will be reviewing and securing previous knowledge of adding 3 addends, understanding they can be added in any order and combined in different ways to bridge through 10

Review strategies for adding and subtracting across 10

Look at the equation. How would you partition 6 to find the sum?

The number line shows an addition strategy. What number is missing from the number line?

Alex adds two number cards together to make a total. Match the numbers to the sums.

Izzy added together two numbers to make a sum. She represented her strategy on a number line. What equation did Izzy do?

What addend is missing from this equation? {{  }} + 4 = 20

What addend is missing from the bar model?

Which of these are number pairs that total 10? 

What addend is missing from this equation? 5 + {{  }} = 10

What is the missing addend? 10 + {{  }} = 14

The two missing addends in the equation have the same value. What is that value?

Addition by bridging through 10

Lesson outcome