Q60 of 83 Page 45

Compute each of the following:

(a) 30 + (–25) + (–10)


(b) (–20) + (–5)


(c) 70 + (–20) + (–30)


(d) –50 + (–60) + 50


(e) 1 + (–2) + (– 3) + (– 4)


(f) 0 + (– 5) + (– 2)


(g) 0 – (–6) – (+6)


(h) 0 – 2 – (–2)

(a) -5


(b) -25



(c) 20



(d) -60


-50 and 50 are additive inverse of each other, i.e. their sum is zero.


(e) -8



(f) -7



(g) 0



(h) 0



More from this chapter

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58

1 + 2 + 3 _______ (–1) + (–2) + (–3)

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Match the items of Column I with that of Column II:

 61

If we denote the height of a place above sea level by a positive integer and depth below the sea level by a negative integer, write the following using integers with the appropriate signs:

a) 200 m above sea level


b) 100 m below sea level


c) 10 m above sea level


d) sea level

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Write the opposite of each of the following:

a) Decrease in size


b) Failure


c) Profit of Rs.10


d) 1000 A.D.


e) Rise in water level


f) 60 km south


g) 10 m above the danger mark of river Ganga


h) 20 m below the danger mark of the river Brahmaputra


i) Winning by a margin of 2000 votes


j) Depositing Rs.100 in the Bank account


k) 20°C rise in temperature.