# Math Help - solve this formula

1. ## solve this formula

.43-.73-.33= what and how to do it

2. ## Re: solve this formula

Use a calculator or solve by hand. To solve by hand, I find that it helps to write each decimal into a fraction and then recall the fact that $(\frac{a}{b})^n = \frac{a^n}{b^n}$

For example, $(.4)^3 = (\frac{4}{10})^3 = \frac{4^3}{10^3} = \frac{64}{1000}$ The process is similar with the other decimals in this formula. then it's a simple matter of addition and subtraction of fractions.