Lesson 19 Fraction Games

- Let’s multiply and divide with fractions.

Warm-up Estimation Exploration: Multiply Fractions

$28 \times 2 \frac{8}{9}$

Record an estimate that is:

too low	about right	too high

Activity 1 Largest Product or Quotient

For each expression, work with your partner to decide what is the greatest product or quotient you can make with the numbers 1, 2, 3, 4, 5, and 6. For each expression, you can only use each number once. Explain or show your reasoning.

$\frac{}{} \times \frac{}{}$
$\div \frac{1}{}$
$\frac{1}{} \div$

Activity 2 Smallest Product or Quotient

For each expression, work with your partner to decide what is the smallest product or quotient you can make with the numbers 1, 2, 3, 4, 5, and 6. You can only use each number once for reach expression. Explain or show your reasoning.

$\frac{}{} \times \frac{}{}$
$\div \frac{1}{}$
$\frac{1}{} \div$

Practice Problem

Problem 1

Using the numbers 4, 5, 6, 7, 8, or 9, what is the largest product you can make? $\frac{}{} \times \frac{}{}$

You can use each number at most once. Explain or show your reasoning.