Solve Problems with Rational Numbers

Lesson 1.7:
Multiply Rational Numbers

Today's Goal:

In today's lesson, we will apply what we have learned about multiplying integers and apply it to rational numbers as well:

Reminder: Even number of negative signs ==> positive product
Odd number of negative signs ==> negative product

Multiple Choice

$$-\frac{4}{5}\times-\frac{7}{8}$$

• $$-\frac{7}{10}$$

• $$-\frac{11}{13}$$

• $$\frac{7}{10}$$

• $$\frac{1}{13}$$

Multiple Choice

$$\frac{4}{5}\times-\frac{9}{11}$$

• $$\frac{36}{55}$$

• $$-\frac{36}{55}$$

• $$-\frac{13}{16}$$

• $$\frac{13}{16}$$

​-0.05 X 8.2

Multiple Choice

-1.5 X 2.3

• -3.45

• 3.45

• -3.8

• 0.8

Multiple Choice

-1.8 X - 2.1

• -3.78

• 3.78

• -3.9

• 0.3

​Conclusion: Write two complete sentences about what you learned.

​I learned when multiplying rational numbers I use the ____ rules as multiplying integers.

When multiplying fractions I will multiply ____ ____.

When multiplying decimals I count the _____.