Example: Estimate the sums of $72$ and $48$

We round the number to the nearest $10$.

$72→70$

$48→50$

So, $72$ is nearest to $70$ and $48$ is nearest to $50$

$70+50=120$

Thus the estimated sum $=120$

Maths

Example: Estimate the sums of $72$ and $48$

We round the number to the nearest $10$.

$72→70$

$48→50$

So, $72$ is nearest to $70$ and $48$ is nearest to $50$

$70+50=120$

Thus the estimated sum $=120$

To find the estimated difference, let us estimate each number to nearest ten thousands.

$489342$ estimated as $490000$

$48365$ estimated as $50000$

Estimated difference $=49000050000=440000$

.

ExampleDefinitionsFormulaes