fractions multiplication of fractions. copyright © 2000 by monica yuskaitis times you would...
TRANSCRIPT
Copyright © 2000 by Monica Yuskaitis
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
Copyright © 2000 by Monica Yuskaitis
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
Copyright © 2000 by Monica Yuskaitis
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.
Copyright © 2000 by Monica Yuskaitis
Multiplying FractionsMultiplying FractionsConceptual UnderstandingConceptual Understanding
½ x ¾ = 3/8 ¼ ¼ ¼ ¼
1/8 1/8 1/8
Copyright © 2000 by Monica Yuskaitis
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
Copyright © 2000 by Monica Yuskaitis
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
Copyright © 2000 by Monica Yuskaitis
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
Copyright © 2000 by Monica Yuskaitis
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
Copyright © 2000 by Monica Yuskaitis
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
Copyright © 2000 by Monica Yuskaitis
Multiply and SimplifyMultiply and Simplify
95
16
= 930 10
3ofx ÷÷
33
=
Copyright © 2000 by Monica Yuskaitis
Multiply and SimplifyMultiply and Simplify
34
89
= 2436 3
2ofx ÷÷1212
=
Copyright © 2000 by Monica Yuskaitis
Multiply and SimplifyMultiply and Simplify
43
72 = 28
6 6)284ofx
2444 4
6÷÷22 = 2
34
Copyright © 2000 by Monica Yuskaitis
Multiply and SimplifyMultiply and Simplify
92
34 = 27
8 8)273ofx
243
38
Copyright © 2000 by Monica Yuskaitis
Multiply and SimplifyMultiply and Simplify
82
73 = 56
6 6)569ofx
542
26
9 26
÷ 22
=9 13÷