Question

Estimate each of the following using general rule.
1)730+998
2)796-314
3)12,904+2,888
4)28,292-21,496​

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.

Answer 2

Answer:

730+998= 1728

796 _ 314= 482

12904+2888= 15792

28292 - 21496= 6796