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Mastering Inverse Operations

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Mastering Inverse Operations

Use the opposite operation to check each calculation. Show your working where asked.

Understand inverse operations

1.Which operation undoes addition?

Multiplication
Subtraction
Division
Doubling

2.Choose the equation that checks 36 + 47 = 83.

83 − 36 = 47
83 + 36 = 47
47 − 36 = 83
83 − 47 = 35

3.Match each addition fact to its related difference fact.

28 + 35 = 63
46 + 19 = 65
125 + 34 = 159
207 + 86 = 293

159 − 34 = 125
63 − 28 = 35
65 − 19 = 46
293 − 86 = 207

4.Fill in each missing number: 74 + 29 = 103, so 103 − 29 = .

5.Fill in each missing number: 138 + 56 = 194, so 194 − = 138.

6.Use the number line to show the jump from 0 to 72, then the jump back by 30. What number do you land on?

Solve and check

7.Work out 168 + 257. Then check your total by subtracting 257 from it.

8.Work out 326 + 148. Write a related number sentence using the difference to check your answer.

9.Ari says 245 + 179 = 414. Use the opposite operation to decide whether Ari is correct. Show the check.

10.Tick every number sentence using a difference that can check 134 + 68 = 202.

202 − 134 = 68
202 − 68 = 134
134 − 68 = 66
202 + 68 = 270

Inverse operations in everyday maths

11.At a market, Anh buys a bag for $126 and a hat for $58. She says she spent $184. Check her total using the opposite operation and state whether she is right.

12.A group collects $238 on one day and $176 the next day. They record a total of $414. Use the opposite operation to check the recorded total.

13.Complete the sentence: The opposite operation can an addition.