A strategy that involves using a  multiple of ten as a 'bridge', so numbers can be partitioned to make use of bonds to ten.

Use bridging to solve addition and subtraction problems

Maths

Add and subtract one to or from a two-digit number within a decade

Add and subtract 1 to and from a 2-digit number crossing the tens boundary

Use number facts to add or subtract a one-digit number and a two-digit number.

Use number facts to solve addition and subtraction problems.

Use number facts to solve problems in measures and data contexts

Use number bonds to 10 to add/subtract one-digit and two-digit numbers

Add by bridging a multiple of ten

Subtract by bridging a multiple of ten

Find 10 more or less than a 2-digit number.

Add and subtract 10 to and from a 2-digit number.

Add multiples of 10 to 2-digit numbers.

Subtract multiples of ten from 2-digit numbers

Partition 2-digit numbers in different ways

Use efficient strategies to solve problems

In this unit pupils will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction. In the future unit pupils will learn to find 10 more or less than a 2-digit number They will  add and subtract 10 to/from a 2-digit number using number facts

In the prior unit pupils added 3 addends. They used strategies such as finding 2 addends to total 10 or 2 numbers to bridge though 10. In this unit pupils will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction.

In this unit pupils will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction.

Adding and subtracting ones and tens to and from 2-digit numbers

Which equation would be used to solve this problem? There were 42 children. 7 were sitting down and the rest were standing up. How many were standing up? 

Alex had put 47 cubes into the tray and then he found 6 more. How many cubes are there altogether? {{ }} cubes.

Sam collected 54 pencils. He kept some to use and put some away in a pot. He put 46 in the pot. How many does he now have to use? {{ }} pencils.

Which of these equations can be solved by bridging a multiple of 10? 

Which of these known facts could help you in solving this equation? 46 + 8 = ___

Look at the ten frames. Which equation does the image represent by showing ‘bridging 10’ to subtract?

Look at the number line. How should 8 be partitioned to ‘bridge 10’ when subtracting?

How could we solve this equation? 23 − 6 = ?  

Which number is missing from this number line?

Look at the number line. What is the missing multiple of ten?

Use bridging to solve addition and subtraction problems

Lesson outcome