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

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

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? 

This lesson will soon be taken down.

Addition by bridging through 10

Lesson outcome