5.3I/J Multiply and Divide Fractions by whole #

5.3I/J Multiply and Divide Fractions by whole #

5.3I Multiplying Fractions

5.3(I) Represent and solve multiplication of a whole number and a fraction that refers to the same whole using objects and pictorial models, including area models.

• Today's Objective: We will solve multiplication of a whole number and a fraction that refers to the same whole.

Key Vocabulary for TEK 5.3I Multiplying Fractions

• Fraction- a numerical quantity that is not a whole number (e.g. 1/2, 0.5). or a small or tiny part, amount of something.

• Whole numbers- Any of the numbers {0, 1, 2, 3, ...} etc.

  
  

  There is no fractional or decimal part. And no negatives.

  
  

  Example: 5, 49 and 980 are all whole numbers.

• Product-The answer when two or more values (factors) are multiplied together.

• Simplify-To simplify (or reduce) a fraction means to make it as simple as possible.

Key Words for Multiplication

5.3I Multiplying Fractions

Let's Practice Multiplying Fractions

TEK 5.3I Multiplying Fractions

Open Ended

When we multiply fractions by a whole number, what is the denominator for the whole number?

Poll

Let's multiply the fraction.

What is the answer?

• 11/9

• 5 X 6/9

• 30/9

• I'm not sure

Poll

Let's multiply the fraction. Reduce/Simplify if needed.

What is the answer?

• 3 3/9

• 3 1/3

• 3

• I'm not sure

Division with Fractions

Divide a Unit Fraction by a Whole Number

• A fraction less than one is split into smaller parts

• The result is a fraction less than the original fraction

•  $\frac{1}{5}\div2$  

•  K  C  F

•  $\frac{1}{5}\times\frac{1}{2}=\frac{1}{10}$  

Open Ended

I do...

Yah'yl has 12 pounds of Skittles. He wants to put the Skittles into bags so that each bag has $\frac{1}{3}$ pound. Write an equation to show how to calculate the number of bags Yah'yl can fill. 

Multiple Choice

We do..

 $\frac{1}{3}\div$  7

• 10

• 21

•  $\frac{1}{21}$  

•  $\frac{1}{10}$  

Multiple Choice

You Do...

Mr. Borelli has 12 gallons of water to fill buckets for field day. If each bucket needs ⅓ of a gallon to fill, how many buckets can he fill?

• 3/12 bucket

• 12 and ⅓ buckets

• 36 buckets

• 4 buckets

Multiple Choice

A pet store had 9 cats to feed. If they only had one-fourth of a bag of cat food and each cat got the same amount, what fraction of the bag would each cat get?

• 36

• 1/5

• 1/32

• 1/36