Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate (by rounding off to nearest tens):
(a) 439 + 334 + 4317
(b) 1,08,737 – 47,599
(c) 8325 – 491
(d) 4,89,348 – 48,365
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(a) 439 round off to 400
334 round off to 300
4317 round off to 4300
Estimated sum = 400+300+4300 = 5000
(b) 108734 round off to 108700
47599 round off to 47600
Estimated difference = 108700-47600 = 61100
(c) 8325 round off to 8300
491 round off to 500
Estimated difference = 8300-500 = 7800
(d) 489348 round off to = 489300
48365 round off to = 48400
Estimated difference = 489300-48400 = 440900
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