Question

KNOWING ON
undreds
EXERCISE 1.3
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1. Estimate each of the following using general rule:
(a) 730 +998 (b) 796 – 314
(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.
2. 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.
3. Estimate the following products using general rule:
(a) 578 x 161 (b) 5281 x 3491 (c) 1291 x 592 (d) 9250 x 29
mate
Make four more such examples.​

Answer 1

Answer:

Solution (a)

730 + 998

Rounding off 730 to the nearest hundreds we get, 700

And rounding off 998 to the nearest hundreds we get, 1,000

Therefore, 700 + 1000 = 1,700

Therefore, estimate of 730+998 is equal to 1,700 according to the general rule.

Solution (b)

796 – 314

Rounding off 796 to the nearest hundreds we get, 800

And rounding off 314 to the nearest hundreds we get, 300

Therefore, 800 - 300 = 500

Therefore, estimate of 796 – 314 is equal to 500 according to the general rule.

Solution (c)

12,904 +2,888

Rounding off 12,904 to the nearest thousands we get, 13,000

And rounding off 2,888 to the nearest thousands we get, 3000

Therefore, 13,000 + 3,000 = 16, 000

Therefore, estimate of 12, 904 + 2,888 is equal to 16,000 according to the general rule.

Solution (d)

28,292 – 21,496

Rounding off 28,292 to the nearest thousands we get, 28,000

And rounding off 21,496 to the nearest thousands we get, 21,000

Therefore, 28,000 - 21,000 = 7,000

Therefore, estimate of 28,292 - 21,496 is equal to 7,000 according to the general rule.

Example (i)

2258-647

Rounding off 2,258 to the nearest thousands we get, 2000

And rounding off 647 to the nearest hundreds we get, 600

Therefore, 2,000-600 = 1,400

Therefore, estimate of 2,258-647 is equal to 1,400 according to the general rule.

Example (vi)

5,045-512

Rounding off 5,045 to the nearest thousands we get, 5000

And rounding off 512 to the nearest hundreds we get, 500

Therefore, 5,000-500 = 4,500

Therefore, estimate of 5,045-512 is equal to 4,500 according to the general rule.

Example (vii)

412-325

Rounding off 412 to the nearest hundreds we get, 400

And rounding off 325 to the nearest hundreds we get, 300

Therefore, 400-300 = 100

Therefore, estimate of 412-325 is equal to 100 according to the general rule.

Example (viii)

10,215+4878

Rounding off 10,215 to the nearest thousands we get 10,000

And rounding off 4,878 to the nearest thousands we get, 5,000

Therefore, 10,000+5,000 =15,000

Therefore, estimate of 10,215+4,878 is equal to 15,000 according to the general rule.

Example (ix)

777+333

Rounding off 777 to the nearest hundreds we get, 800

And rounding off 333 to the nearest hundreds we get, 300

Therefore, 800 + 300 = 1,100

Therefore, estimate of 777+333 is equal to 1,100 according to the general rule.

Example (x)

247+789

Rounding off 247 to the nearest hundreds we get, 200

And rounding off 789 to the nearest hundreds we get, 800

Therefore, 200 + 800 = 1,000

Therefore, estimate of 247+789 is equal to 1,000 according to the general rule.

Step-by-step explanation:

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