multiplication of fractions
DESCRIPTION
Multiplication of Fractions. Times You Would Multiply a Fraction Times a Fraction. Your family eats 1/8 of 1/2 of a left over wedding cake. 1/8 of 1/2 or 1/8 x 1/2. Times You Would Multiply a Fraction Times a Fraction. - PowerPoint PPT PresentationTRANSCRIPT
Times You Would Multiply a Times You Would Multiply a Fraction Times a FractionFraction Times a Fraction
Your family eats 1/8 of 1/2 of a left over wedding cake.
1/8 of 1/2 or 1/8 x 1/2
Times You Would Multiply a Times You Would Multiply a Fraction Times a FractionFraction Times a Fraction
Jose had already read 1/2 of his novel. Today he read 1/12 of the 1/2 left. How much of the book has he read?
1/12 of 1/2 or 1/12 x 1/2
Multiplying FractionsMultiplying FractionsConceptual UnderstandingConceptual Understanding
When you multiply two fractions that are between 0 and 1 the product is smaller than both fractions.
½ x ¾ = 3/8 Look at the diagram on the next slide to understand why.
Multiplying FractionsMultiplying FractionsConceptual UnderstandingConceptual Understanding
½ x ¾ = 3/8 ¼ ¼ ¼ ¼
1/8 1/8 1/8
How to Find a Fraction of a How to Find a Fraction of a FractionFraction
The first thing to remember is “of” means multiply in mathematics.
of = x
How to Find a Fraction of a How to Find a Fraction of a FractionFraction
Step 1 - When you see a fraction problem you know when you read “of” in the problem you multiply.
ofx12
49
How to Find a Fraction of a How to Find a Fraction of a FractionFraction
Step 2 – Multiply your numerators straight across.
x 49
12 = 4
How to Find a Fraction of a How to Find a Fraction of a FractionFraction
Step 3 – Then multiply your denominators straight across.
x 49
12 = 4
18
How to Find the Fraction of a How to Find the Fraction of a FractionFraction
Step 4 – Simplify your answer. In this case we reduce.
x 49
12 = 4
18÷÷
22= 2
9