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How to multiply a whole number by a fraction.

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Presentation on theme: "How to multiply a whole number by a fraction."— Presentation transcript:

1 How to multiply a whole number by a fraction.
1 NUMERATOR DENOMINATOR 1 1 4 4 2 4 x = x = = 6 1 6 6 3 Make the whole number 4 into a fraction. Multiply the 4/1 by 1/6 Multiply the two numerators Multiply the two denominators Reduce fraction, if needed 4 2 1 1 1 = 1 6 3 6 6 6 6 =

2 How to multiply a whole number by a fraction.
2 NUMERATOR DENOMINATOR 1 1 5 5 1 5 x = x = = 1 4 1 4 4 4 Make the whole number 5 into a fraction. 1 1 Multiply the 5/1 by 1/4 4 4 Multiply the two numerators Multiply the two denominators Reduce fraction, if needed 1 1 1 1 1 4 4 4 4 1 = = 1 4

3 How to multiply a whole number by a fraction.
3 NUMERATOR DENOMINATOR 1 1 5 5 2 5 x = x = = 1 3 1 3 3 3 Make the whole number 5 into a fraction. Multiply the 5/1 by 1/3 1 1 3 3 Multiply the two numerators Multiply the two denominators Reduce fraction, if needed 1 1 1 2 1 3 3 3 3 2 = 1 3

4 How to multiply a whole number by a fraction.
4 NUMERATOR DENOMINATOR 1 1 4 4 2 4 x = x = = 10 10 1 10 5 Make the whole number 4 into a fraction. Multiply the 4/1 by 1/10 Multiply the two numerators Multiply the two denominators Reduce fraction, if needed 4 2 1 1 1 1 = 10 5 10 10 10 10 =

5 How to multiply a fraction by a whole number
5 NUMERATOR DENOMINATOR 2 2 4 8 2 x x 4 = = = 2 3 3 1 3 3 Rewrite the 2/3. Make the 4 into a fraction (4/1). 2 2 3 3 Multiply the two numerators Multiply the two denominators Reduce fraction, if needed 2 2 2 1 1 3 3 3 2 = 2 = 3

6 How to multiply a fraction by a whole number
6 NUMERATOR DENOMINATOR 2 2 4 8 2 x x 4 = = = 2 3 3 1 3 3 Rewrite the 2/3. Make the 4 into a fraction (4/1). 2 2 3 3 Multiply the two numerators Multiply the two denominators Reduce fraction, if needed 2 2 2 1 1 3 3 3 2 = 2 = 3

7 How to multiply a fraction by a whole number
7 NUMERATOR DENOMINATOR 1 1 5 5 x x 5 = = 8 8 1 8 Rewrite the 1/8. Make the 5 into a fraction (5/1). Multiply the two numerators Multiply the two denominators Reduce fraction, if needed 5 1 1 1 1 1 8 8 8 8 8 8 =

8 How to multiply a fraction by a whole number
8 NUMERATOR DENOMINATOR 3 3 3 9 x x 3 = = 10 1 10 10 Rewrite the 3/10. Make the 3 into a fraction (3/1). Multiply the two numerators Multiply the two denominators Reduce fraction, if needed 3 3 3 9 10 10 10 10 =

9 1 1 1 1 x 3 = = 3 3 3 9 How to divide a fraction by a whole number
NUMERATOR DENOMINATOR 1 1 1 1 x 3 = = 3 3 3 9 Rewrite the 1/3. Make the 3 into a fraction (flip, write as 1/3). Multiply the two numerators Multiply the two denominators Make a model, divide each section into 3 equal parts

10 1 1 1 1 x 5 = = 4 4 5 20 How to divide a fraction by a whole number
10 NUMERATOR DENOMINATOR 1 1 1 1 x 5 = = 4 4 5 20 Rewrite the 1/4. Make the 5 into a fraction (flip, write as 1/5). Multiply the two numerators Multiply the two denominators Make a model, divide each section into 5 equal parts

11 1 3 3 9 x = 9 = = 3 3 1 1 1 How to divide a whole number by a fraction
11 NUMERATOR DENOMINATOR 1 3 3 9 x = 9 3 = = 3 1 1 1 Rewrite the 3 as a fraction. Rewrite the 1/3 as a flipped fraction (flipped 3/1). Multiply the two numerators Multiply the two denominators Make a model

12 1 2 4 8 x = 8 = = 4 2 1 1 1 How to divide a whole number by a fraction
12 NUMERATOR DENOMINATOR 1 4 2 8 x = 8 4 = = 2 1 1 1 Rewrite the 4 as a fraction. Rewrite the 1/2 as a flipped fraction (flipped 2/1). Multiply the two numerators Multiply the two denominators Make a model

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