Unit 2 5.NF.3 and 5.NF.4a

Unit 2 Review 5.NF.3 and 5.NF.4a

Multiplying a Fraction by a Whole Number

Dividing to whole numbers and getting a fractional answer.

5.NF.4a Multiplying a Fraction by a Whole Number

• We know: when you multiply two whole numbers your product is larger than either of your factors

• We learned: When you multiply a fraction by a whole number, your product lands some where in-between your two factors.

• Remember: When multiplying a fraction by a whole number, make your whole number a fraction by putting a 1 as the denominator.

• To multiply fractions, multiply numerator by numerator and then denominator by denominator.

• You may have to use what you know about division to help you solve the problem.

• Don't forget: Simplify!

Let's Practice!

Hint: OF = X

Multiple Choice

 $\frac{1}{3}\ of\ 27$  

• 9

• 18

•  $\frac{1}{9}$  

•  $\frac{1}{18}$  

Multiple Choice

 $\frac{1}{12}\ of\ 60$  

• 50

• 5

•  $\frac{1}{5}$  

•  $\frac{1}{50}$  

Multiple Choice

Mark drove 3/4 of a 36 km trip before he stopped to get gas for his car. How many kilometers had Mark driven at that point?

• 9

• 18

• 27

• $\frac{3}{4}$

5.NF.3 Dividing whole numbers to get a fractional product

• Not all numbers divide evenly into each other. Sometimes you end up with mixed numbers or fractional answers.

• We have seen this when working with the Better Buy Scenarios.

• Remember: Use ratio tables to help you get a common number of items for each deal then compare prices.

• What you do to the bottom, you gotta do to the top.

Multiple Select

Which is the Better Buy 4 cans for $3 or 8 cans for $6?

• 4 for $3

• 8 for $6

• Same deal

Multiple Select

Which is the Better Buy? 5 cans for $6 or 8 cans for $10?

• 5 for $6

• 8 for $10

• Same deal