# How do you add 2.2x10^7, 6.12x10^6, 1.51x10^7, and 1.09x10^6?

Mar 30, 2015

You first have to get them to the same $10$power

$6.12 \cdot {10}^{6} = 0.612 \cdot {10}^{7}$
$1.09 \cdot {10}^{6} = 0.109 \cdot {10}^{7}$
(decimal point 1 to the left means power goes up by 1)

$\left(2.2 + 0.612 + 1.51 + 0.109\right) \cdot {10}^{7} = 4.431 \cdot {10}^{7}$