Question

Estimate the following using general rule:

28,292 – 21,496

Answer 1

Using the general rule, rounding off each term to its greatest place,

Here we will round off both the terms to their nearest ten thousands.

$28,292$ rounds off to $30,000$ and $21,496$ rounds off to $20,000$.

Therefore, $(28,292-21,496)$ can be estimated as:
$=30,000-20,000$
$=10,000$

Note: There are multiple answers possible depending on your estimation to the nearest tens, hundreds, thousands or ten thousands. The estimate which is closest to the actual answer is the most meaningful answer.