Year 7

# Subtracting positive numbers

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## Lesson details

### Key learning points

- In this lesson, we will explore the relationship between subtracting positive numbers and adding additive inverses.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

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### 6 Questions

Q1.

Which word best fills in the gap in this sentence: We can think of addition as _____________ a point on the number line.

fixing

turning

Q2.

Two numbers are additive inverses if their sum is _____.

equal

negative

opposite

subtraction

Q3.

Which sentence best describes the calculation: 3 +(-4) = -1?

A point starts at (-1), is translated 4 spaces to the left and finishes at -3.

A point starts at (-4), is translated 3 spaces to the left and finishes at -1.

Q4.

What is the additive inverse of -4.2?

-4.2

0

42

Q5.

Joanna thinks the following calculation pair are additive inverses: 10 + (-50) + (-18) and (-10) + 50 + 18. Is she correct?

No, Joanna is incorrect.

Q6.

Write the sum that the number line is modelling.

82 - (-8) = 90

82 + (-8) = 90

90 - 8 = 82

### 7 Questions

Q1.

Fill in the gap: Two numbers are additive inverses if their sum is _____.

equal

negative

opposite

subtraction

Q2.

Which words (in order) best complete this sentence: __________________________ can be viewed as the addition of the ____________________________.

Additive inverse, subtraction

Sum, additive inverse

Sum, subtraction

Q3.

Which numbers best complete this number sentence in order: 9 - ___ = 9 + ___ = 4

(-13), 13

(-5), 5

13, (-13)

Q4.

Select the calculation that could be represented by this diagram.

-12 - 10 = -2

-2 - 12 = 10

Q5.

Calculate 2-5

-7

3

7

Q6.

Calculate (-2)-5

-3

3

7

Q7.

Calculate (-2) + (-5)

-3

3

7