Exercise 6.3
Q1. Find
(a) 35 – (20)
(b) 72 – (90)
(c) (– 15) – (– 18)
(d) (–20) – (13)
(e) 23 – (– 12)
(f) (–32) – (– 40)
Solution:
(a) 35 – (20)
= 15 Answer
(b) 72 – (90)
= - 18 Answer
(c) (– 15) – (– 18)
= - 15 + 18
= 3 Answer
(d) (–20) – (13)
= - 20 - 13
= - 33 Answer
(e) 23 – (– 12)
= 23 + 12
= 35 Answer
(f) (–32) – (– 40)
= - 32 + 40
= 8 Answer
Q2. Fill in the blanks with >, < or = sign.
(a) (– 3) + (– 6) ______ (– 3) – (– 6)
(b) (– 21) – (– 10) _____ (– 31) + (– 11)
(c) 45 – (– 11) ______ 57 + (– 4)
(d) (– 25) – (– 42) _____ (– 42) – (– 25)
Solution:
(a) (– 3) + (– 6) ______ (– 3) – (– 6)
= - 9 __________ - 3 + 6
= - 9 < 3 Answer
(b) (– 21) – (– 10) _____ (– 31) + (– 11)
= - 21 + 10 ________ - 31 - 11
= - 11 > - 42 Answer
(c) 45 – (– 11) ______ 57 + (– 4)
= 45 + 11 _____ 57 - 4
= 56 > 53 Answer
(d) (– 25) – (– 42) _____ (– 42) – (– 25)
= - 25 + 42 ______ - 42 + 25
= 17 > - 17 Answer
Q3. Fill in the blanks.
(a) (– 8) + _____ = 0
(b) 13 + _____ = 0
(c) 12 + (– 12) = ____
(d) (– 4) + ____ = – 12
(e) ____ – 15 = – 10
Solution :
(a) (– 8) + _____ = 0
= - 8 + 8 = 0
(a) 8 Answer
(b) 13 + _____ = 0
= 13 + (- 13) = 0
(b) - 13 Answer
(c) 12 + (– 12) = ____
= 12 + (-12) = 0
(c) 0 Answer
(d) (– 4) + ____ = – 12
= - 4 + (-8) = - 12
(d) - 8 Answer
(e) ____ – 15 = – 10
= 5 - 15 = - 10
(e) 5 Answer
Q4. Find
(a) (– 7) – 8 – (– 25)
(b) (– 13) + 32 – 8 – 1
(c) (– 7) + (– 8) + (– 90)
(d) 50 – (– 40) – (– 2)
Solution :
(a) (– 7) – 8 – (– 25)
= - 7 - 8 + 25
= - 15 + 25
= 10 Answer
(b) (– 13) + 32 – 8 – 1
= - 13 + 32 - 9
= 32 - 22
= 10 Answer
(c) (– 7) + (– 8) + (– 90)
= - 7 - 8 - 90
= - 105 Answer
(d) 50 – (– 40) – (– 2)
= 50 + 40 + 2
= 92 Answer
