To split a whole up into parts; a piece or section of a whole.

Subtract two-digit numbers crossing the tens boundary

Maths

In this 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 future unit pupils will add 3 addends, understanding they can be added in any order, bridging through 10.

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

Addition and subtraction of two 2-digit numbers

Which of the following equations will have a difference of a multiple of 10?

Which number line could be used to solve the equation shown? 63 − 29 = ?

Use the pattern to predict the answer to the next equation. 74 − 49 = {{ }}

Use the pattern to predict the next equation in the sequence.

Write a subtraction equation, then solve it to find the missing part in the bar model.

Match each equation to the number that correctly completes it.

Which bar model could represent the problem shown? There were 56 animals on the farm. 40 were sheep, 2 were pigs and the rest were cows. How many cows were there?

Which number line represents what has happened in the problem? First, there were 96 children in the hall, then 1 left, then 40 more left. How many children are left in the hall now?

Izzy had 78 p and spends 42 p. How much money does she have left? Use the coins shown to help you find out.

Which number line represents what has happened in the problem? I had 74 stickers on my chart. 34 were smiley faces and rest were stars. How many were stars?

Andeep counts 87 minibeasts in the garden. 35 were ants and the rest were woodlice. How many woodlice were there? Which equation would solve this problem? Tick all that apply.

There are 86 crows on the farmer’s field and 53 fly away. How many crows are left? Write the equation to solve this problem.

This lesson will be removed by end of Summer Term 2025.

Subtract two-digit numbers crossing the tens boundary

Lesson outcome

This lesson will be removed by end of Summer Term 2025.