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Estimate each of the following using general rule:
(a) 730 + 998 (b) 796 − 314 (c) 12, 904 + 2, 888
(d) 28, 292 − 21, 496
Make ten more such examples of addition, subtraction and estimation of their outcome.
a) By rounding off to hundreds
730 rounded to 700
998 rounded to 1000
1000 + 700 = 1700
b) by rounding off to hundreds
796 = 800
314 = 300
800 - 300 = 500
c) By rounding off to thousands
12,904 = 13000
2,888 = 3,000
13000+3000= 16000
d)By rounding off to thousands
28,292 = 28,000
21,496 = 21,000
28,000- 21,000 = 7,000
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, 365
Make four more such examples.
(a) 439 + 334 + 4317
Rounding off to nearest hundreds, 439, 334, and 4317 may be rounded off to 400, 300, and 4300 respectively.
Rounding off to nearest tens, 439, 334, and 4317 may be rounded off to 440, 330, and 4320 respectively.
(b) 1,08,734 − 47,599
Rounding off to hundreds, 1,08,734 and 47,599 may be rounded off to 1,08,700 and 47,600 respectively.
Rounding off to tens, 1,08,734 and 47,599 may be rounded off to 1,08,730 and 47,600 respectively.
(c) 8325 − 491
Rounding off to hundreds, 8325 and 491 may be rounded off to 8300 and 500 respectively.
Rounding off to tens, 8325 and 491 may be rounded off to 8330 and 490 respectively.
(d) 4,89,348 − 48,365
Rounding off to hundreds, 489348 and 48365 may be rounded off to 489300 and 48400 respectively.
Rounding off to tens, 489348 and 48365 may be rounded off to 489350 and 48370 respectively.
Estimate the following products using general rule:
(a) 578 × 161 (b) 5281 × 3491
(c) 1291 × 592 (d) 9250 × 29
(a) 578 × 161
Rounding off by general rule, 598 and 161 may be rounded off to 600 and 200 respectively.
(b) 5281 × 3491
Rounding off by general rule, 5281 and 3491 may be rounded off to 5000 and 3000 respectively.
(c) 1291 × 592
Rounding off by general rule, 1291 and 592 may be rounded off to 1000 and 600 respectively.
(d) 9250 × 29
Rounding off by general rule, 9250 and 29 may be rounded off to 9000 and 30 respectively.
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