Year 7
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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