Question

Question 2(c)

Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate
(by rounding off to nearest tens):
8325 – 491

Answer 1

By rounding off to nearest hundreds , the rough estimate of their difference can be calculated as:

8325 can be rounded off to 8300.
491 can be rounded off to 500.
Hence, the estimated difference = 8300 - 500 = 7800 .

By rounding off to nearest tens, the rough estimate of their difference can be calculated as:

8325 can be rounded off to 8330.
491 can be rounded off to 490.
Hence, the estimated difference = 8330 - 490 = 7840.