1. Fractions XV Multiplication of Fractions with Mixed Numbers
by Monica Yuskaitis

2. Times You Would Multiply a Mixed Number Times a Fraction
In a car race, the track is 2 ¼ miles long. If the car breaks down ½ way through the course, how far did you go?
1/2 of 2 1/4 or 1/2 x 2 1/4
Copyright © 2000 by Monica Yuskaitis

3. Multiplying Fractions Conceptual Understanding
When you multiply a positive mixed number by a fraction between 0 and 1 the product is less than the mixed number.
1¼ x ½ = 5/8
Look at the diagram on the
next slide to understand why.
Copyright © 2000 by Monica Yuskaitis

4. Multiplying Fractions Conceptual Understanding
1¼ x ½ = 5/8
1/8
1/8
1/8
1/8
1/8
Copyright © 2000 by Monica Yuskaitis

5. How to Find a Fraction of a Mixed Number
The first thing to remember is “of” means multiply in mathematics. of x =
Copyright © 2000 by Monica Yuskaitis

6. How to Find a Fraction of a Mixed Number
Step 1 - When you see a fraction problem you know when you read “of” in the problem you multiply. 1 4 x of 3 2 9
Copyright © 2000 by Monica Yuskaitis

7. How to Find a Fraction of a Mixed Number
Step 2 – Change the mixed number to an improper fraction.
27 + 4 1 4 31 + x 3 2 9 9 x 27
Copyright © 2000 by Monica Yuskaitis

8. How to Find a Fraction of a Mixed Number
Step 3 – Multiply the numerators straight across. 1 31 31 x = 2 9
Copyright © 2000 by Monica Yuskaitis

9. How to Find a Fraction of a Mixed Number
Step 4 – Multiply the denominators straight across. 1 31 31 x = 2 9 18
Copyright © 2000 by Monica Yuskaitis

10. How to Find a Fraction of a Mixed Number
Step 5 – Simplify your answer. In this case change the improper fraction to a mixed number. 13 1 18 1 31 31
18) 31 x = 2 9 18 18 13
Copyright © 2000 by Monica Yuskaitis

11. Copyright © 2000 by Monica Yuskaitis
Multiply and Simplify
35 + 4 4 39 39 1 + x 5 = 4 x 7 7 28 35 11 1 28
28) 39
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12. Copyright © 2000 by Monica Yuskaitis
Multiply and Simplify
27 + 1 1 28
112 4 + x 3 = 7 x 9 9 63 27 1 49 7 7 ÷ = 63 7 9
63) ÷
112
Copyright © 2000 by Monica Yuskaitis

13. Copyright © 2000 by Monica Yuskaitis
Multiply and Simplify
24 + 3 3 27
108 4 + x 6 = 4 4 20 5 x 24 8 4 2 5 ÷ = 20 4 5 ÷
20)
108
Copyright © 2000 by Monica Yuskaitis

14. Copyright © 2000 by Monica Yuskaitis
Multiply and Simplify
You’re
shining!
24 + 1 1 25 50 2 + x 6 = 4 4 20 5 x 24 2 10 10 1 ÷ = 20 10 2
20) ÷ 50
Copyright © 2000 by Monica Yuskaitis

15. Copyright © 2000 by Monica Yuskaitis
Credits
Clipart from “Microsoft Clip
Gallery” located on the Internet at
clipgallerylive/default.asp
Copyright © 2000 by Monica Yuskaitis