# pssh fractions n multiplying...

• Feb 28th 2007, 03:37 PM
Merlin_Hart
pssh fractions n multiplying...
kay well i need help cause i dont know how to do this
13: 6 * 2/5
14: 5 * 3/7
15: 5 * 2/11
16: 2 * 2/5
17:2 1/2 * 3/4
18: 2 1/4 * 3/5
19: 1 1/2 * 3/7
20: 1 1/3 * 4/5

anyone care to like answere em or explain to me how to do this ? its confuzleses me reaaaaaaly bad.....:( ;) :confused: :eek: :rolleyes:
• Feb 28th 2007, 06:37 PM
Aryth
Well, when you multiply fractions, you treat the numerators (top number) and the denominators (bottom number) separately. And then put them back together as one whole fraction. Let's look at them:

13. 6 * 2/5

Can be rewritten as:

6/1 *2/5

We can separate the numerators:

6 * 2 = 12 <--- That is our new numerator

Same with our denominators:

1 * 5 = 5 <--- That is our new denominator

If we put those together, we get:

12/5

14. 5 * 3/7

Using the same process:

5/1 * 3/7

5 * 3 = 15 <-- New numerator
1 * 7 = 7 <-- New denominator

Giving us:

15/7

15. 5 * 2/11

5/1 * 2/11

5 * 2 = 10
1 * 11 = 11

Giving us:

10/11

16. 2 * 2/5

2/1 * 2/5

2 * 2 = 4
1 * 5 = 5

Giving us:
4/5

17. For this one we must switch the mixed number 2 1/2 into an improper fraction, and how we do that is this:

We take the denominator and multiply it by the whole number:

2 * 2 = 4

4 + 1 = 5 <-- Our new numerator

Making our fraction:

5/2

So our problem is rewritten like this:

5/2 * 3/4

We solve like normal:

5 * 3 = 15
2 * 4 = 8

Giving us:

15/8

18. Same thing here:

4 * 2 = 8

8 + 1 = 9

Giving us: 9/4

9/4 * 3/5

9 * 3 = 27
4 * 5 = 20

Giving us:
27/20

19. 1 1/2 = (2 * 1 + 1) /2 = 3/2

3/2 * 3/7

3 * 3 = 9
2 * 7 = 14

Giving us:
9/14

20. 1 1/3 = (3 * 1 + 1) /3 = 4/3

4/3 * 4/5

4 * 4 = 16
3 * 5 = 15

Giving us:
16/15

13. 12/5
14. 15/7
15. 10/11
16. 4/5
17. 15/8
18. 27/20
19. 19/4
20. 16/15

I hope that helped.