### Home > MC2 > Chapter 5 > Lesson 5.1.3 > Problem 5-38

5-38.

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

0.4

Find a common denominator.

See part (b).

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

4.8

When you subtract a negative, you add its opposite.

Multiply the numerators together and the denominators together.

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