# How do you add 4.77 x 10^4 and 8.62 x 10^5?

Apr 6, 2015

You first take them to the same $10$-power

$4.77 \cdot {10}^{4} = 0.477 \cdot {10}^{5}$

Now you can add:

$0.477 \cdot {10}^{5} + 8.62 \cdot {10}^{5} =$
$\left(0.477 + 8.62\right) \cdot {10}^{5} =$
$9.097 \cdot {10}^{5} \approx 9.10 \cdot {10}^{5}$
(rounded to three significant digits)