question_answer

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:

(a) We have, \[119639369\]

Rounded off 11963 to nearest tens = 11960 and rounded off 9369 to nearest tens = 9370

So, estimated difference\[=119609370=2590\]

(b) We have, \[768777783\]

Rounded off 76877 to nearest tens = 76880 and rounded off 7783 to nearest tens = 7780

So, estimated difference \[=768807780\]

= 69100

(c) We have, \[10732-4354\]

Rounded off 10732 to nearest tens = 10730 and rounded off 4354 to nearest tens = 4350

So, estimated difference \[=107304350\]

= 6380.

(d) We have, \[=7820316407\]

Rounded off 78203 to nearest tens = 78200 and rounded off 16407 to nearest tens = 16410

So, estimated difference\[~=7820016410\]

= 61790.