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Understanding Subtraction Concepts

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Understanding Subtraction Concepts

Read each question carefully. Show your working where asked.

Subtraction Vocabulary

1.In 34 − 19 = 15, name the minuend, the subtrahend and the difference.

2.What is the mathematical name for the relationship between addition and subtraction?

The operations undo each other
Repeated operations
Equal operations
Separate operations

3.At a swimming carnival, Harper has 31 event points and her team uses 14 points for a relay bonus. Write a subtraction equation to show how many points remain.

4.Which situations can be worked out using subtraction? Select all that apply.

Finding how many biscuits remain after 7 are eaten from a box of 20
Finding the total number of laps swum in two races
Working out how much money remains after spending $12 from $30
Finding the difference between two race times
Adding 6 swimmers to a team of 14

Addition and Subtraction Connections

5.Use the numbers 26, 9 and 17 to complete the related fact family.

6.Find the missing number in □ − 28 = 46. Explain how an addition fact can help you find it.

7.At the swimming carnival, Mason's team scores 63 points. It gives 27 points to another team after a scoring correction. How many points does Mason's team have now? Write the subtraction equation and a related addition equation to check your result.

Problem Solving

8.Hudson collects 48 relay batons for the swimming carnival. He sets aside 19 for the finals. Draw or complete a part-part-whole diagram to show how many batons are not set aside.

9.Use 42, 18 and 24 to write a short swimming-carnival story that can be solved with subtraction. Include the subtraction equation and its answer.

10.Explain why addition and subtraction are called inverse operations. Include an example using 52, 16 and 36.