Dividing Fractions - What Do I "Keep?"

Dividing Fractions - What Do I "Keep?"

Poll

What fraction skills can you CONFIDENTLY do?

• Multiply Fractions

• Add and Subtract Fractions

• Find Like Demoninators

• Reduce Fractions

• Turn Mixed Numbers into Improper Fractions

Proficiency Scale Dividing Fractions

• I can Multiply Fractions

• I can Turn mixed numbers into improper fractions

• I can Simplify Fractions

• I can demonstrate the steps of dividing fractions. Keep. Change. Flip.

• I can explain what fraction to "keep" and why.

Multiple Select

4 is the same as

• $\frac{\text{4}}{\text{1}}$

• $\frac{4}{4}$

• $2\frac{8}{4}$

• $\frac{16}{4}$

• $\frac{1}{4}+\frac{1}{4}+\frac{1}{4}+\frac{1}{4}$

Multiple Choice

 $\frac{1}{2}\times\frac{3}{4}$  

•  $\frac{3}{8}$  

•  $\frac{3}{24}$  

•  $\frac{3}{6}$  

Multiple Choice

 $\frac{1}{5}+\frac{2}{10}$  

•  $\frac{3}{15}$  

•  $\frac{7}{11}$  

•  $\frac{4}{10}$  

Multiple Select

Select which fractions are EQUIVILANT:

• $\frac{2}{8}$

• $\frac{1}{4}$

• $\frac{8}{2}$

• $\frac{10}{40}$

• $\frac{8}{24}$

Division of Fractions Has Pattern

• Keep. Change. Flip.

• To understand this pattern, we need to understand what we keep.

• We keep what we are dividing or making into pieces or parts.

• We change the operation from division to mulitplication

• Flip the number of parts we want to make (or make an inverse fraction or reciprocal)

What will we keep?

Malyla is using her phone. Its battery life is down to 2/5 , and it drains another 1/9 every hour. How many hours will her battery last?

We will keep the 2/5 because that is what we are breaking it up into 1/9s and we want to know how many hours the battery will last.

What will we keep?

Taj is playing a video game where each round lasts 7/12 of an hour. He has scheduled 3 and 3/4 hours to play the game. How many rounds can he play?

 $3\ \frac{3}{4}$  to play. Breaking it into rounds. Each Round is  7/12. 

 $3\ \frac{3}{4}\div\frac{7}{12}$  becomes   $\frac{15}{4}\times\frac{12}{7}$  

Multiple Choice

 A serving of potato chips is ¾ ounce. A large bag of potato chips contains 16 ½ ounces. How many servings are in the bag of potato chips? WHAT DO WE KEEP?

• 3/4 ounces

•  $16\ \frac{1}{2}$  ounces