1. Multiplying a Fraction by a fraction Let’s Be Rational- CMP3
Brownie Pan Models
Multiplying a Fraction by a fraction
Let’s Be Rational- CMP3

2. Brownie Pan Model – Example 1
Amici Bakery has 1 3 of a brownie pan left. They sell 3 4 of the pan to Mrs. Chanley. How much of the brownie pan did Mrs. Chanley buy?
Think: Mrs. Chanley buys what part of the pan of brownies that remains? 𝑜𝑓 1 3

3. Brownie Pan Model – Example 1
3 4 × 1 3 = 3 12
What is three-quarters of the one-third? In other words…
How many boxes out of the total boxes have overlapping colors?

4. Brownie Pan Model – Example 1
Make sure to reduce your final answer.
3 4 × 1 3 = = 1 4
Mrs. Chanley purchased of the whole brownie pan.

5. Brownie Pan Model – Example 2
Mr. Higgins owns 𝟑 𝟒 of an acre of land.
He wants to sell 𝟒 𝟓 of the land to his friend.
How much of the acre did Mr. Higgins sell?
Think: Mr. Higgins sells what part of the acre that he owns? 𝑜𝑓 =

6. Brownie Pan Model – Example 2
𝟒 𝟓 × 𝟑 𝟒 = 𝟏𝟐 𝟐𝟎
What is four-fifths of the three-quarters? In other words…
How many boxes out of the total boxes have overlapping colors?

7. Make sure to reduce your final answer.
Brownie Pan Model – Example 2
Make sure to reduce your final answer.
4 5 × 3 4 = = 3 5
Mr. Higgins sold of an acre of land.

8. How much of the pan of lasagna does Mr. Sidler take home?
Brownie Pan Model – Example 3
Mr. Sidler takes home 𝟏 𝟐 of a pan of lasagna that is 𝟑 𝟕 full from his aunt’s house.
How much of the pan of lasagna does Mr. Sidler take home?
Think: Mr. Sidler takes home what part of the lasagna that remains? 𝑜𝑓 3 7 =

9. Brownie Pan Model – Example 3
𝟏 𝟐 × 𝟑 𝟕 = 𝟑 𝟏𝟒
What is one-half of the three-sevenths? In other words…
How many boxes out of the total boxes have overlapping colors?

10. Make sure to reduce your final answer.
Brownie Pan Model – Example 3
Make sure to reduce your final answer.
1 2 × 3 7 = 3 14
Mr. Sidler brought home of the whole pan of lasagna.