NCERT Solutions
Class 7 Maths
Large Numbers Around Us

Ex. 1.1 Q.8
Verify a – (-b) = a + b for the following values of a and b:
(i) a = 21, b = 18 (ii) a = 118, b =125 (iii) a = 75, b =84 (iv) a = 28, b =11
(i) Given: a = 21, b = 18
We have
a – (-b) = a + b
Putting the values in L.H.S., we get
21 – (-18) = 21 + 18 = 39
Putting the values in R.H.S., we get
21 + 18 = 39
Since, L.H.S. = R.H.S
Hence, verified.
(ii) Given: a = 118, b = 125
We have
a – (-b) = a + b
Putting the values in L.H.S., we get
118 – (-125) = 118 + 125 = 243
Putting the values in R.H.S., we get
118 + 125 = 243
Since, L.H.S. = R.H.S
Hence, verified.
(i) Given: a = 75, b = 84
We have
a – (-b) = a + b
Putting the values in L.H.S., we get
75 – (-84) = 75 + 84 = 159
Putting the values in R.H.S., we get
75 + 84 = 159
Since, L.H.S. = R.H.S
Hence, verified.
(i) Given: a = 28, b = 11
We have
a – (-b) = a + b
Putting the values in L.H.S., we get
28 – (-11) = 28 + 11 = 39
Putting the values in R.H.S., we get
28 + 11 = 39
Since, L.H.S. = R.H.S
Hence, verified.