EXERCISE 6.3
1) Subtract :
(a) 35 – (20)
Ans.
= 15 .
(b) 72 – (90)
Ans.
= −18 .
(c) (−15) – (− 18)
Ans.
= −15 + 18
= 3 .
(d) (− 20) – (13)
Ans.
= 20 − 13
= – 33 .
(e) 23 – ( −12)
Ans.
= 23 + 12
= 35 .
(f) (-32 ) – (−40)
Ans.
= − 32 + 40
= 8 .
2) Fill in the blanks with ˃ , < or = sign :
(a) (−3) + (−6) < (− 3) – (−6 )
Ans.
− 3 − 6 < − 3 + 6
(−9) < 3
(b) (−21 ) – (−10) > (−31) + (−11 )
Ans.
−21 + 10 > − 31 – 11
− 11 > −42
(c) 45 – ( −11) > 57 + (− 4)
Ans.
45 + 11 > 57 – 4
56 > 53
(d) (−25 ) – (−42) > (− 42 ) – (−25 )
Ans.
– 25 + 42 > – 42 + 25
17 > -17
3)
(a) (−7 ) – 8 – (−25)
Ans.
= −7 – 8 + 25
= − 15 + 25 = 19 − 9
= 10 = 10
(b) (−13) + 32 – 8 – 1
Ans.
= -13 + 32 – 8 – 1
(c) (−7) + (− 8) + (− 90 )
Ans.
= −7 – 8 – 90
= − 15 – 90
= − 105
(d) 50- (- 40) – (- 2)
Ans.
= 50 + 40 +2
= 92