ML Aggarwal CBSE Solutions Class 7 Math First Chapter Integers Exercise 1.3

ML Aggarwal CBSE Solutions Class 7 Math 1st Chapter Integers Exercise 1.3

Ex – 1.3

(1) Find the following products:

(i) 7 x (-35)

(ii) (-13) x (-15)

(iii) (-12) x (-11) x (-10)

(iv) (-13) x 0 x (-24)

(v) (-1) x (-2) x (-3) x 4

(vi) (-3) x (-6) x (-2) x (-1)

(2) Verify

(i) 37 x [6 + (-3)] = 37 x 6 + 37 x (-3)

(ii) (-21) x [(-6) + (-4)] = (-21) x (-6) + (-21) x (-4)

(3) (i) 8 x 53 x (-125)

(ii) (-8) x (-2) x 3 x (-5)

(iii) (-6) x 2 x (-8) x 5

(iv) 15 x (-25) x (-4) x (-10)

(v) 26 x (-48) + (-48) x (-36)

(vi) 724 x (-56) + (-724) x 44

(vii) (-47) x 102

(viii) (-39) x (-97)

(4) (i) (-4) x ___ = 44

(ii) 7 x ___ = -42

(iii) ____ x (-13) = 143

(iv) (-5) x ____ = 0

(5) A certain freezing process requires that room temperature be lowered from 32 degree Celsius at the rate of 5 degree Celsius every hour. What will be the room temperature 8 hours after the freezing process begins?

(6) In a class test containing 10 questions, 5 marks are  awarded for every incorrect answer and 0 for questions not attempted.

(i) Rohit gets four correct and six incorrect answers. What is his score?

(ii) Seema gets 5 correct and 5 incorrect answers. What is her score?

(iii) Ritu attempted 7 questions and gets only 2 correct answers. What is her score?

(7) (i) Find a pair of integers whose product is -15 and whose difference is 8.

(ii) Find a pair of integers whose product is -36 and whose difference is 15.

Solution

_____ x _____