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) 8325-491 (c) 4,89,348-48,365
Answers
A) 439 + 334 + 4317
⇒ 400 + 300 + 4300 = 5,000
⇒ 440 + 330 + 4320 = 5,090
b) 108,734 - 47,599
⇒ 108,700 - 47,600 = 61,100
⇒ 108,730 - 47,600 = 61,130
c) 8325 - 491
⇒ 8300 - 500 = 7800
⇒ 8330 - 500 = 7830
d) 489,348 - 48,365
⇒ 489,300 - 48,400 = 440,900
⇒ 489,350 - 48,370 = 440,980
(a) 439 + 334 + 4317
Rounding off to nearest hundreds
439 + 334 + 4317 = 400 + 300 + 4300
= 5000
Rounding off to nearest tens
439 + 334 + 4317 = 440 + 330 + 4320
= 5090
(b) 108734 – 47599
Rounding off to nearest hundreds
108734 – 47599 = 108700 – 47600
= 61100
Rounding off to nearest tens
108734 – 47599 = 108730 – 47600
= 61130
(c) 8325 – 491
Rounding off to nearest hundreds
8325 – 491 = 8300 – 500
= 7800
Rounding off to nearest tens
8325 – 491 = 8330 – 490
= 7840
(d) 489348 – 48365
Rounding off to nearest hundreds
489348 – 48365 = 489300 – 48400
= 440900
Rounding off to nearest tens
489348 – 48365 = 489350 – 48370
= 440980
Four more examples are as follows
(i) 4853 + 662
Rounding off to nearest hundreds
4853 + 662 = 4800 + 700
= 5500
Rounding off to nearest tens
4853 + 662 = 4850 + 660
= 5510
(ii) 775 – 390
Rounding off to nearest hundreds
775 – 390 = 800 – 400
= 400
Rounding off to nearest tens
775 – 390 = 780 – 400
= 380
(iii) 6375 – 2875
Rounding off to nearest hundreds
6375 – 2875 = 6400 – 2900
= 3500
Rounding off to nearest tens
6375 – 2875 = 6380 – 2880
= 3500
(iv) 8246 – 6312
Rounding off to nearest hundreds
8246 – 6312 = 8200 – 6300
= 1900
Rounding off to nearest tens
8246 – 6312 = 8240 – 6310
= 1930
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