Exercise 6.2
Page No 128:
Question 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
Answer:
(a)
Hence, 8
(b)

Hence, 0
(c)

Hence, −4
(d)

Hence, −5
Question 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)
Answer:
(a)
Hence, 3
(b)

Hence, −6
(c)

Hence, −8
(d)

Hence, 5
(e)

Hence, −6
(f)

Hence, 2
Question 3:
Add without using number line:(a) 11 + (− 7)
(b) (− 13) + (+18)
(c) (− 10) + (+19)
(d) (− 250) + (+ 150)
(e) (− 380) + (− 270)
(f) (− 217) + (− 100)
Answer:
(a) 11 + (−7) = 4(b) (−13) + (+18) = 5
(c) (−10) + (+19) = 9
(d) (−250) + (+150) = −100
(e) (−380) + (−270) = −650
(f) (−217) + (−100) = −317
Page No 129:
Question 4:
(a) 137 and −354 (b) − 52 and 52(c) − 312, 39 and 192 (d) − 50, − 200 and 300
Answer:
(a) 137 + (−354) = −217(b) −52 + 52 = 0
(c) −312 + 39 + 192 = −312 + 231 = −81
(d) −50 + (−200) + 300 = −250 + 300 = 50
Question 5:
Find the sum:(a) (− 7) + (− 9) + 4 + 16 (b) (37) + (− 2) + (− 65) + (− 8)
Answer:
(a) (−7) + (−9) + 4 + 16 = −16 + 20 = 4(b) 37 + (−2) + (−65) + (−8) = 37 + (−75) = −38
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