Monday

October 20, 2014

October 20, 2014

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

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 11:39am1 - 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 12:42pmOkay, 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 12:49pm1/2 = 30/60

1/3 = 20/60

What do you think 1/4 equals?

- Basic Math -
**Walter**, Monday, February 14, 2011 at 2:20pm1/4 = 15/60

1/5 = 12/60

What do you think?

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

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

**Answer this Question**

**Related Questions**

math - 5/10+12/16+(15/20-4/16) Well you need to solve in the parentheses first, ...

math - in what way is subtracting fractions with unlike denominators like adding...

Math - I still do not understand Today was my first day learning how to add 3 ...

Algebra 1-Fractions - Or, eliminating fractions, I should say. So, I need some ...

Math Fractions - What is the first step to adding multiple fractions (3) with ...

math - adding fractions with unlike denominators: 7/9 + 5/6?

Math - How would I describe a step-by-step procedure for adding two fractions ...

math - adding and subtracting fractions with unlike denominators

math - how to you compare 8 fractions with different denominators including ...

math - how do you estimate fractions with different denominators on a number ...