Posted by **Walter** on Monday, February 14, 2011 at 11:32am.

I need help adding fractions with different denominators.

Here is the problem...

1 - 1/2 + 1/3 - 1/4 + 1/5 - 1/6

I can see that the demoninators increase. Since they are both addition and subtraction, how do I do this problem?

Thanks, Walter, New York.

- Basic Math -
**Ms. Sue**, Monday, February 14, 2011 at 11:39am
1 - 1/2 + 1/3 - 1/4 + 1/5 - 1/6

You need to find the common denominator -- the smallest number divisible by each of the denominators.

One way to do that is to find the multiples of the largest.

6, 12, 18, 24, 30, 36, 42, 48, 54, 60

Ahh -- the common denominator is 60.

1/2 = 60/2 = 30/60

1/3 = 60/3 = 20/60

That should give you a good start.

- Basic Math -
**Walter**, Monday, February 14, 2011 at 12:42pm
Okay, Now that the common demoninator is 60, I now multiply. But where do I start? for example, I just leave the 1 alone because its a whole number. So now I multiply the 1/2 to 1 * 30 = 30 and 2 * 30 = 60 Do I do the same for the 1/3 and so on?

- Basic Math -
**Ms. Sue**, Monday, February 14, 2011 at 12:49pm
1/2 = 30/60

1/3 = 20/60

What do you think 1/4 equals?

- Basic Math -
**Walter**, Monday, February 14, 2011 at 2:20pm
1/4 = 15/60

1/5 = 12/60

What do you think?

- Basic Math -
**joann**, Wednesday, February 23, 2011 at 10:01am
solve 5/30+3/40+1/8

- Basic Math -
**William**, Monday, February 27, 2012 at 1:10pm
what is 5/30 + 3/40 + 1/8

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