Question

Estimate the following using general rule:
12,904 + 2,888

Answer 1

We can round off each term to its nearest thousand to make our calculation easy. Then we can get the estimated sum as:

$\begin{array}{cc}\text{12904 round off to}& =13000\\ \text{2888 round off to}& =3000\\ \text{Estimated difference}& =10000\end{array}$