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

(a) 439 round off to 400
334 round off to 300
4317 round off to 4300
Estimated sum = 5000

(b) 108734 round off to 108700
47599 round off to 47600
Estimated difference = 61100

(c) 8325 round off to 8300
491 round off to 500
Estimated difference = 7800

(d) 489348 round off to 489300
48365 round off to 48400
Estimated difference = 440900

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