Question

Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate(by rounding off to nearest tens) :(a)   439 + 334 + 4,317          (b)    1,08,734 – 47,599       (c)    8325 – 491(d)   4,89,348 – 48,365Make four more such examples.

Answer 1

(a) `439+334+4317`
When rounding off to nearest hundreds,
`400+300+4300 = 5000`
When rounding off to nearest tens,
`440+330+4320 = 5090`

(b) `108734 - 47599`
When rounding off to nearest hundreds,
`108700 - 47600 = 61400`
When rounding off to nearest tens,
`108730 - 47600 = 61430`

(c) `8325 - 491`
When rounding off to nearest hundreds,
`8300 - 500 = 7800`
When rounding off to nearest tens,
`8330 - 490 = 7840`

(d) `489348 - 48365`
When rounding off to nearest hundreds,
`489300 - 48400 = 440900`
When rounding off to nearest tens,
`489350 - 48370 = 440980`