RS Aggarwal Class 7 Mathematics First Chapter Integers Exercise 1D Solution
EXERCISE 1D
OBJECTIVE QUESTIONS
Mark (√) against the correct answer in each of the following:
(1) 6 – (- 8)
= 6 + 8 = 14
Ans: (c)
(2) – 9 – (- 6)
= – 9 + 6 = – 3
Ans: (b)
(3) By how much does 2 exceed – 3?
= 2 – ( – 3)
= 2 + 3 = 5
Ans: (d)
(4) What must be subtracted from – 1 to get – 6?
= – 1 – (- 6)
= – 1 + 6 = 5
Ans: (a)
(5) How much less than – 2 is – 6?
= – 2 – (- 6)
= – 2 + 6 = 4
Ans: (a)
(6) On subtracting 4 from – 4, we get
= – 4 – 4 = – 8
Ans: (b)
(7) By how much does – 3 exceed – 5?
= – 3 – (- 5)
= – 3 + 5 = 2
Ans: (b)
(8) What must be subtracted from – 3 to get – 9?
= – 3 – (- 9)
= – 3 + 9 = 6
Ans: (c)
(9) On subtracting 6 from – 5, we get
= – 5 – 6 = – 11
Ans: (c)
(10) On subtracting – 13 from – 8, we get
= – 8 – (- 13)
= – 8 + 13 = 5
Ans: (c)
(11) (- 36) ÷ (- 9)
Ans: (a)
(12) 0 ÷ (- 5)
= 0
Ans: (b)
(13) (- 8) ÷ 0
Ans: (c)
(14) Which of the following is a true statement?
Ans: (b) – 11 < – 8
(15) The sum of two integers is 6. If one of them is – 3, then the other is
= 6 – (- 3)
= 6 + 3 = 9
Ans: (b)
(16) The sum of two integers is – 4. If one of them is 6, then the other is
= – 4 – 6 = – 10
Ans: (a)
(17) The sum of two integers is 14. If one of them is – 8, then the other is
= 14 – (- 8)
= 14 + 8 = 22
Ans: (a)
(18) The additive inverse of – 6 is
Ans: (c)
(19) (- 15) × 8 + (- 15) × 2
= – 120 + (- 30)
= – 120 – 30 = – 150
Ans: (b)
(20) (- 12) × 6 – (- 12) × 4
= – 72 – (- 48)
= – 72 + 48 = – 24
Ans: (b)
(21) (- 27) × (- 16) + (- 27) × (- 14)
= 432 + 378 = 810
Ans: (b)
(22) 30 × (- 23) + 30 × 14
= – 690 + 420 = – 270
Ans: (a)
(23) The sum of two integers is 93. If one of them is – 59, the other one is
= 93 – (- 59)
= 93 + 59 = 152
Ans: (c)
(24) (?)÷ (- 18) = – 5
= (- 18) × (- 5)
= 90
Ans: (b)
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