Exercise 6.2
Q1. Using the number line write the integer which is :
(a) 3 more than 5
Solution:
(b) 5 more than –5
Solution :
(c) 6 less than 2
Solution :
(d) 3 less than –2
Solution :
Q2. 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)
Solution Q2:
(a) 9 + (– 6)
Solution:
(b) 5 + (– 11)
Solution :
(c) (– 1) + (– 7)
Solution :
(d) (– 5) + 10
Solution :
(e) (– 1) + (– 2) + (– 3)
Solution :
(f) (– 2) + 8 + (– 4)
Solution :
Q3. Add without using number line :
(a) 11 + (– 7)
(b) (– 13) + (+ 18)
(c) (– 10) + (+ 19)
(d) (– 250) + (+ 150)
(e) (– 380) + (– 270)
(f) (– 217) + (– 100)
Q4. Find the sum of :
(a) 137 and – 354
(b) – 52 and 52
(c) – 312, 39 and 192
(d) – 50, – 200 and 300
Solution:
(a) 137 and – 354
137 + (-354)
= 137 - 354
= – 217 Answer
Solution:
(b) – 52 and 52
= (- 52) + 52
= 0 Answer
Solution:
(c) – 312, 39 and 192
(– 312) + 39 + 192
= - 312 + 231
= - 81 Answer
Solution:
(d) – 50, – 200 and 300
(– 50) + (– 200) + 300
= (- 250) + 300
= 50 Answer
Q5. Find the sum :
(a) (– 7) + (– 9) + 4 + 16
(b) (37) + (– 2) + (– 65) + (– 8)
Solution:
(a) (– 7) + (– 9) + 4 + 16
= (- 16) + 20
= 4 Answer
Solution :
(b) (37) + (– 2) + (– 65) + (– 8)
= (37) + (- 75)
= 37 - 57
= – 38 Answer