Write the digits 0, 1, 2, 3, …, 9 in this order and insert ‘+’ or ‘–’ between them to get the result 3.
Temperature of a place at 12:00 noon was +5°C. Temperature
increased by 3°C in first hour and decreased by 1°C in the second
hour. What was the temperature at 2:00 pm?
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.
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
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)
Match the items of Column I with that of Column II:
Column I Column II
(i) The additive inverse of +2 (A) 0
(ii) The greatest negative integer (B)–2
(iii) The greatest negative even integer (C)2
(iv) The smallest integer greater than every negative integer (D)1
(v) Sum of predecessor and successor of –1 (E)–1
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