Q.1: Using the number line write the integer which is :
(a) 3 more than 5
(b) 5 more than –5
(c) 6 less than 2
(d) 3 less than –2
Ans:
Q.2 : Use number line and add the following integers:
(a) 9 + (– 6) (b) 5 + (– 11)
(c) (– 1) + (– 7) (d) (– 5) + 10
(e) (– 1) + (– 2) + (– 3) (f) (– 2) + 8 + (– 4)
Ans:
Q.3. Add without using number line :
(a) 11 + (– 7)
(b) (– 13) + (+ 18)
(c) (– 10) + (+ 19)
(d) (– 250) + (+ 150)
(e) (– 380) + (– 270)
(f) (– 217) + (– 100)
Ans: (a) 11 + (-7) = 4
(b) (-13) + (+18) = 5
(c) (-10) + (+19) = -10 + 19 = 9
(d) (-250) + (+150) = -250 + 150 = -100
(e) (-380) + (-270) = -380 – 270 = -650
(f) (-217) + (-100) = -217 – 100 = -317
Q.4. Find the sum of:
(a) 137 and – 354
(b) – 52 and 52
(c) – 312, 39 and 192
(d) – 50, – 200 and 300
Ans: (a) 137 and -354
= (137) + (-354)
= 137 – 354
= -217
(b) -52 and 52
= (-52) + (+52)
= -52 + 52
= 0
(c) -312, 39 and 192
= (-312) + (+39) + (+192)
= – 312 + 39 + 192
= -312 + 231
= -81
(d) -50, -200 and 300
= (-50) + (-200) + (+300)
= – 50 – 200 + 300
= – 250 + 300
= 50
Q.5. Find the sum:
(a) (– 7) + (– 9) + 4 + 16
(b) (37) + (– 2) + (– 65) + (– 8)
Ans: (a) (-7) + (-9) + 4 + 16
= (-7) + (-9) + 4 +16
= -16 + 20
= 4
(b) (37) + (-2) + (-65) + (-8)
= (37) + (-2) + (-65) + (-8)
= (+37) + (-75)
= -38