Remember to align the decimal points when adding the terms.

$19.13$

You can think of this as
$−1(6+9)$.

$5−4$

$−3$

The answer should be negative.

This answer should be positive. Why?

$\frac{11}{15}-\frac{7}{20}=\frac{44}{60}-\frac{21}{60}$

$\frac{44-21}{60}=\frac{23}{60}$

$\frac{23}{60}$

−4