Estimate each of the following using the general rule:

a) 730 + 998

b) 796 – 314

c) 12904 + 2888

d) 28292 – 21496

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1700, 500, 16,000, 7000

1900, 500, 16,000, 9000

1900, 500, 17,000, 9000

1900, 600, 17,000, 9000

answer is A.

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Detailed Solution

Concept- First, round each value to the nearest hundred or thousand. Next, determine the difference or sum of the rounded-off figures. Put the necessary amount or difference in writing.
(a) If 730 is rounded off, 700 is the expected value.
By rounding to the next whole number, 998 will be equivalent to 1000.
As a result, the anticipated value is 730 + 998 = 700 + 1000 = 1700.
(b) If you round the value of 796 to the nearest whole number, you get 800.
If 314 is rounded off, it will be about equal to 300.
The predicted value is therefore

796 314 = 800 - 300 = 500

.
(c) If 12904 is rounded off, the estimated value is 13000.
If 2888 is rounded off, the estimated value will be 3000.
The expected value is therefore 1