Posted by **Lynn** on Saturday, July 10, 2010 at 9:09pm.

How do you simplify the following fraction;

72

---

-68

I know the answer is

-18

---

-17

What I do not know is how this is the answer.The example I looked at did not tell me how it came to the answer. What do I do to find the answer?

- Math (Algebra) -
**Ana**, Saturday, July 10, 2010 at 9:11pm
divide the numerator by 4. Divide the denominator by 4.

- Math (Algebra) -
**Lynn**, Saturday, July 10, 2010 at 9:14pm
Thank you, but how do I determine what number to divide by? So that I an solve other fractions like this one. Must I still find the greatest common number to divide by?

- Math (Algebra) -
**Ms. Sue**, Saturday, July 10, 2010 at 9:55pm
Yes. You find the largest common divisor to reduce a fraction.

Example?

10/15

Divide by 5

10/15 = 2/3

- Math (Algebra) -
**Quidditch**, Sunday, July 11, 2010 at 12:23am
Be careful. You posted (72)/(-68) reduces to (-18)/(-17). You had a sign change in the numerator. Probably just a typo, but you might want to check.

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