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
47599 round off to -47600
Estimated difference =441700

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