# How do you write (1.5 times 10^5) - (8 times 10^4) in standard form?

Oct 19, 2015

With addition and subtraction you will have to get the 10-powers the same.

#### Explanation:

You can write $1.5 \cdot {10}^{5} = 15 \cdot {10}^{4}$

$15 \cdot {10}^{4} - 8 \cdot {10}^{4} = \left(15 - 8\right) \cdot {10}^{4} = 7 \cdot {10}^{4}$

Since the power is positive we move the dec.point 4 to the right:

$= 70000$