Mastering Multiplication and Division of Fractions and Mixed Numbers

The video tutorial covers the multiplication and division of fractions and mixed numbers. It explains that a common denominator is not needed for multiplication, and fractions can be multiplied directly across. For division, the KCF (Keep, Change, Flip) method is introduced, which involves keeping the first fraction, changing the division to multiplication, and flipping the second fraction. The tutorial also addresses converting whole numbers and mixed numbers into improper fractions and simplifying results. The video concludes with a summary of the key points discussed.

When multiplying fractions, do you need a common denominator?

• Yes, always

• Only if the fractions are mixed numbers

• No, you can multiply straight across

• Only if the fractions are improper

Tags

CCSS.5.NF.B.6

What is the result of multiplying 7/9 by 2/27?

• 14/243

• 14/27

• 7/54

• 2/243

Tags

CCSS.5.NF.B.6

How do you convert a whole number into a fraction?

• Subtract 1 from it

• Put it over 1

• Add 1 to it

• Multiply it by 2

Tags

CCSS.3.NF.A.3C

What is the improper fraction form of the mixed number 3 2/3?

• 10/3

• 9/2

• 8/3

• 11/3

What does KCF stand for in dividing fractions?

• Keep, Convert, Flip

• Keep, Change, Fraction

• Keep, Change, Flip

• Keep, Convert, Fraction

Tags

CCSS.6.NS.A.1

What is the reciprocal of 9/25?

• 25/1

• 1/25

• 25/9

• 9/25

What is the result of dividing 7/10 by 9/25 using KCF?

• 35/18

• 18/35

• 7/25

• 10/9

Tags

CCSS.6.NS.A.1

How do you handle a negative sign when converting a mixed number to an improper fraction?

• Tack it on at the end

• Add it to the numerator

• Multiply it with the fraction

• Ignore it

What is the improper fraction form of -5 2/5?

• -25/5

• -27/5

• -23/5

• -22/5

What is the result of dividing -5 2/5 by 3 1/2 using KCF?

• -10/27

• -27/10

• -35/54

• -54/35

Tags

CCSS.7.NS.A.2B