Warm Up Problem There are 300 students in a middle school. If 17% of the students brought veggies as a snack, how many students brought veggies as a snack?

Multiply Fractions Lesson 4-3

Objectives I can multiply a fraction by a fraction. I can simplify BEFORE I multiply.

Multiplying Fractions Step 1: Multiply the numerators Step 2: Multiply the denominators Step 3: Simplify

Example 1 Find 1 3 x 1 4 . Write in simplest form. Multiply the numerators and denominators: 1 3 x 1 4 = 1 12 Model:

Got It? Find 1 2 x 3 5 Find 1 3 x 3 4 Find 2 3 x 5 6 Finished? Try drawing a model.

Example 2 Find 3 4 x 5 6 . Simplify. Can we simplify, before we multiply? 3 & 6 have the common factor of 3. So divide both by 3. 1 4 x 5 2 = 5 8 Double check: 3 4 x 5 6 = 15 24 15 24 ÷ 3 3 = 5 8

Example 3 Find 4 9 x 18. 4 9 x 18 1 Can we simply before we multiply? 4 1 x 2 1 = 8 1 or 8

Got It? 4) 3 4 x 4 9 5) 5 6 x 9 10 6) 3 5 x 10

Example 4 Frank had 1 2 of the lawn left to mow. On Saturday, he mowed 2 3 of what was left. What fraction of the entire lawn did Frank more on Saturday? 1 2 x 2 3 Divide the numerator and denominator by 2. 1 1 x 1 3 = 1 3 So, Frank mowed 1 3 of the lawn on Saturday.

Got It? 7) Rick has 1 2 of a foot-long sub left from yesterday. He ate 1 3 of the leftover as a snack. What fraction of the entire sandwich did he eat as a snack?

Homework Hint #12 Write an example of each scenario to see if it is true or false. Example: The product of two fractions are always greater than ½. 1 3 𝑥 2 5 = 2 15 This is false.