Question

how do you add a negetive and a positive faction? -5/8 + 2/9 = ?

Answer 1

First you need to find the equivalent fractions with a common denominator.

Then you subtract the negative number from the positive number.

I'll be glad to check your answer.

Answer 2

I came out with a common denominator of 72.
do I just put -5/72 + 2/72 = -3/72? I haven't done Algeria in 50 years. I am very rusty.

Answer 3

You're on the right track.

But -- you need to multiply the numerator by the multiple of the denominator to get the equivalent fraction.

72 divided by 8 = 9
9 times 5 = 45

-5/8 = -45/72
2/9 = 16/72

16/72 - 45/72 = -29/72

Answer 4

Thank you Sue! My daughter says she thinks she has it now. I hope she does, because I am till confused. You know its true what they say, It's hard to teach an old dog new tricks. Thanks again, Dean

Answer 5

You're very welcome.

I understand you. But hang in there. I'm 76 and am still learning.