ML Aggarwal CBSE Solutions Class 7 Math First Chapter Integers Exercise 1.4

ML Aggarwal CBSE Solutions Class 7 Math 1^st Chapter Integers Exercise 1.4

Ex – 1.4

(1) (i) (-36) ÷ (-9)
(ii) 150 ÷ (-25)
(iii) (-270) ÷ 27
(iv) (-59) ÷ 59
(v) 0 ÷ (-17)
(vi) (-784) ÷ (-56)
(2) (i) 13 ÷ [(-2_ + 1]
(ii) [(-6) + 5] ÷ [(-2) + 1]
(3) Verify that (a÷b) ÷ c ≠ a ÷ (b÷c) for a = -225, b = 15 and c = -3
(4) Verify that a ÷ (b + c) ≠ (a ÷ b) + (a ÷ c) for
(i) a = -10, b = 1 and c = 1
(ii) a = 12, b = 1 and c = -2
(5) (i) 239 ÷ ____ = 1
(ii) (-85) ÷ ____ = -1
(iii) (-213) ÷ ____ = 1
(iv) (-43) ÷ _______ = 43
(v) ____ ÷ ((-21) = 4
(vi) (-66) ÷ _____ = -3

(6) Write five pairs of integers (a, b) such that a ÷ b = -3 one such pair is (-6, 2).
(7) In a competition 3 marks are given for every correct answer and (-2) marks are given for every incorrect answer and no marks for not attempting any question.
(i) Sachin scored 24 marks. If he got 14 correct answers, how many questions has he attempted incorrectly?
(ii) Nalini scores (-7) marks in the competition, though she has got 9 correct answers. How many questions she has attempted incorrectly?
(8) An elevator descends into a mine shaft at the rate of 6 m / min. If the descend starts from 10 m above the ground level, how long will it take to reach the shaft 350 m below the ground level?