Q31Written answer
(–a) + b = b + Additive inverse of __________.
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Worked solution
a:
(–a) + b = b + (-a)
(–a) + b = b + Additive inverse of (a)
NCERT Exemplar · Class 7 · Maths
Chapter 1: Integers
Practice each question, then open the answer or worked solution.
Questions
83 questionsQ32Written answer
________ ÷ (–10) = 0
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Worked solution
0:
0 ÷ (–10) = 0/(-10) = 0
Q33Written answer
(–157) × (–19) + 157 = ___________
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Worked solution
3140:
(–157) × (–19) + 157 = (2983) + 157 = 3140
Q34Written answer
[(–8) + ______ ] + ________ = ________ + [(–3) + ________ ] = –3
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Worked solution
-3, 8, -8, 8:
Q35Written answer
On the following number line, (–4) × 3 is represented by the point _________.
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Worked solution
D:
(-4) x 3 = -12
Each division on the number line is 2 units. So, D represent -12
Q36Written answer
If x, y and z are integers then (x +___ ) + z = _____ + (y + _____ )
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Worked solution
y, x, z:
By associative property of integers, we have
(x + y) + z = x + (y + z)
Q37Written answer
(– 43) + _____ = – 43
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Worked solution
0:
(– 43) + 0 = – 43
Q38Written answer
(– 8) + (– 8) + (– 8) = _____ × (– 8)
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Worked solution
3:
(– 8) + (– 8) + (– 8) = -24 = 3 × (– 8)
Q39Written answer
11 × (– 5) = – ( _____ × _____ ) = _____
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Worked solution
11, 5, -55:
11 × (– 5) = – (11 × 5 ) = -55
Q40Written answer
(– 9) × 20 = _____
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Worked solution
-180:
(– 9) × 20 = -180