Question

estimate each of the following genral rule

12904+2888

Answer 1

$$\begin{gathered} 12904\mathrm{gets}\mathrm{rounded}\mathrm{off}\mathrm{to}10000 \\ 2888\mathrm{gets}\mathrm{rounded}\mathrm{off}\mathrm{to}3000 \\ \mathrm{Now},\mathrm{estimated}\mathrm{sum}=10000+3000=13000 \end{gathered}$$