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.
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