Q. 14.3( 64 Votes )

Estimate each of the following using general rules:

(a) 730 + 998

(b) 796 – 314

(c) 12,904 +2,888

(d) 28,292 – 21,496

Make ten more such examples of addition, subtraction and estimation of their outcome.

Answer :

(a) 730+998


By rounding off to hundreds,


730 rounds off to 700 and,


998 rounds off to 1000,


So we have;


= 700+1000


= 1700


(b) 796 - 314


By rounding off to hundreds,


796 rounds off to 800 and,


314 rounds off to 300


We get,


= 800 - 300


= 500


(c) 12904 + 2822


By rounding off to thousands,


12904 rounds off to 13000 and,


2822 rounds off to 3000.


We get,


= 13000+3000


= 16000


(d) 28,296 – 21, 496


By rounding off to nearest thousands,


28,296 rounds off to 28000


21,496 rounds off to 21,000


We get,


= 28,000 – 21,000


= 7,000

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