Mastering Multiplication and Division of Fractions

Tiffany explains how to multiply and divide fractions, emphasizing the simplicity of multiplication and the keep-change-flip rule for division. She provides five examples, demonstrating multiplication without a common denominator, simple multiplication, division with reciprocal, handling improper fractions, and cross-cancelling. The video concludes with a call to action for more resources.

What is the first step in multiplying fractions?

• Find a common denominator

• Multiply the numerators

• Simplify the fractions

• Add the numerators

Tags

CCSS.5.NF.B.6

What is the result of multiplying 1/9 by 1/2?

• 1/18

• 2/9

• 1/4

• 1/11

Tags

CCSS.5.NF.B.6

What rule is used for dividing fractions?

• Add, subtract, multiply

• Cross-multiply and divide

• Keep it, change it, flip it

• Simplify before multiplying

Tags

CCSS.6.NS.A.1

After flipping the second fraction in a division problem, what should you do next?

• Subtract the fractions

• Multiply the fractions

• Find a common denominator

• Divide the fractions

Tags

CCSS.6.NS.A.1

What is the reciprocal of 3/8?

• 4/3

• 8/3

• 3/8

• 1/24

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2B

In the 'keep it, change it, flip it' rule, what does 'flip it' refer to?

• Keeping the first fraction the same

• Changing the division sign to multiplication

• Simplifying the fraction

• Switching the numerator and denominator of the second fraction

Tags

CCSS.7.NS.A.2A

How do you convert an improper fraction to a mixed number?

• Divide the numerator by the denominator

• Subtract the denominator from the numerator

• Multiply the numerator by the denominator

• Add the numerator to the denominator

What is the simplified form of 20/15?

• 1 1/3

• 4/3

• 1 2/3

• 1 1/2

What does cross-cancellation achieve before multiplying fractions?

• It flips the fractions

• It changes the fractions to decimals

• It simplifies the fractions

• It finds a common denominator

Tags

CCSS.5.NF.B.6

What is the result of the division example involving cross-cancellation?

• 3/7

• 21/10

• 10/21

• 5/14

Tags

CCSS.7.EE.B.3