Exercise 1A
Question 1
(i) The greatest negative integer is -1 .
(ii) 0 is greater than every negative integer.
(iii) The absolute value of an integer is either equal to or greater than the integer, but never less than the integer.
(iv) The successor of -91 is -90 .
(v) The predecessor of -380 is -381.
Question 2
Replace each blank by < or > to make the given statement true.
(i) -8 ___ -18
Sol : >
(ii) -4 ___ 0
Sol : <
(iii) -357 ____ -537
Sol : >
(iv) -71 ____ 17
Sol : <
Question 3
(i) Arrange the following integers in ascending order
-8,-4,0,-11,9,4,6,13,-27,19
Sol :
-27,-11,-8,-4,0,4,6,9,13,19
(ii) Arrange the following integers in descending order
-6,-11,12,-32,-23,14,0,32,16,-19,-18
Sol :
32,16,14,12,0,-6,-11,-18,-19,-23,-32
Question 4
Add :
(i) -18 , 14
Sol :
=-18+14
=-4
(ii) -26, -3
Sol :
=-26+(-3)
=-26-3=-29
(iii) 46, -46
Sol :
=+46-46=0
(iv) 400, -31, -71
Sol :
=400+(-31)+(-71)
=400-31-71
=400-102
=298
(v) -613, -421, -700
Sol :
=-613+(-421)+(-700)
=-613-421-700
=-1034-700
=-1734
Question 5
Subtract the first integer from the second in each case:
(i) 6, 18
Sol :
=18-6=12
(ii) -3, 6
Sol :
=6-(-3)
=6+3=9
(iii) -27, -54
Sol :
=-54-(-27)
=-54+27=-27
(iv) 12, -7
Sol :
=-7-12
=-19
Question 6
Find the value of :
(i) -37-(-15)-2
Sol :
=-37+15-2
=-37+13
=-24
(ii) 16-[14-(-2)-(-6)]
Sol :
=16-[+14+2+6]
=16-14-2-6
=16-14-8
=+2-8
=-6
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