## Basic College Mathematics (10th Edition)

-$\frac{1}{10}$- $\frac{9}{10}$ Subtraction is changed to addition Negative $\frac{9}{10}$ is changed to its opposite (-$\frac{9}{10}$) -$\frac{1}{10}$ + (-$\frac{9}{10}$) To add two negative numbers , first add there absolute values |-$\frac{1}{10}$| = $\frac{1}{10}$ and |-$\frac{9}{10}$| = $\frac{9}{10}$ $\frac{1}{10}$ + $\frac{9}{10}$ = $\frac{10}{10}$ =1 Now write the negative sign in front of 1 -$\frac{1}{10}$- $\frac{9}{10}$ = -1