### Home > CC2MN > Chapter 7 > Lesson 7.2.7 > Problem7-137

7-137.

Evaluate each expression.

1. $1.2-0.8$

Remember to line up the decimal points when adding or subtracting numbers with decimals.

$0.4$

1. $-4-(-2)$

When you subtract a negative, you add its opposite.

1. $-\frac{6}{11}-(-\frac{1}{4})$

Find a common denominator.

See part (b).

1. $\frac { 2 } { 3 } \cdot \frac { 2 } { 5 }$

Multiply the numerators together and the denominators together.

$\frac{4}{15}$

1. $0.6·8$

When you multiply numbers with decimals, you do not need to line up the decimal points.

$4.8$

1. $-\frac{5}{4}\cdot\frac{8}{13}$

Remember, a negative number multiplied by a positive number is always a negative number.