Question

Question 178

Estimate each of the following by rounding off each number to nearest tens.
(a) 11963 - 9369
(b) 76877 - 7783
(c) 10732 - 4354
(d) 78203 - 16407

Answer 1

(a) We have, 11963 - 9369
Rounded of 11963 to nearest tens = 11960
and rounded off 9369 to nearest tens = 9370
So, estimated difference = 11960 - 9370 = 2590
(b) We have, 76877 - 7783
Rounded off 76877 to nearest tens = 76880
and rounded off 7783 to nearest tens = 7780
So, estimated difference = 76880 - 7780 = 69100
(c) We have, 10732 - 4354
Rounded off 10732 to nearest tens = 10730
and rounded off 4354 to nearest tens = 4350
So, estimated difference = 10730 - 4350 = 6380
(d) We have, 78203 - 16407
Rounded off 78203 to nearest tens = 78200
and rounded off 16407 to nearest tens = 16410
So, estimated difference = 78200 - 16410 = 61790