Reorder means arrange something in a different way.

Understand why the order of addition and subtraction steps can be chosen

Maths

In this unit pupils will accurately and efficiently solve multi-step addition and subtraction problems. They will understand and explain how both addition and subtraction equations can be used to describe the same additive relationship In the future unit pupils will identify the addends and the sum in column addition They will use their knowledge of place value to correctly lay out column addition

In the prior unit pupils reviewed and secured previous knowledge of adding 3 addends, understanding they could be added in any order, bridging through 10. In this unit pupils will accurately and efficiently solve multi-step addition and subtraction problems. They will understand and explain how both addition and subtraction equations can be used to describe the same additive relationship.

Understand additive relationships and apply them to rearrange equations

Which expression would give the same answer as 10 + 5 − 3?

True or false? 11 + 1 – 3 is equal to 11 – 3 + 1

True or false? 11 + 4 – 5 is equal to 11 – 2 + 1

Match the expressions which have the same answer.

There are 8 people on a bus. At the next stop, 3 people get on the bus and 4 people get off. How many people are on the bus? Which calculation would give the correct answer? 

What step needs to be added to make this correct? 14 + 6 − 5 is equal to 14 − 5 ___

How can Izzy reorder this equation so it has the same value? 45 + 30 = 75

The equation 20 + 18 = 38 has been reordered in different ways. Match up the parts of the equations to make them correct. 

Find the missing part. 42 + $$\square$$ = 62

What is the missing number? $$\square$$ = 50 + 14

Izzy and Lucas are collecting conkers. Izzy has 14 conkers and Lucas has 8 conkers. They find another 6 conkers. How many do they have altogether? 

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Understand why the order of addition and subtraction steps can be chosen

Lesson outcome