# Basic Math

posted by .

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 -

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 -

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 -

1/2 = 30/60
1/3 = 20/60

What do you think 1/4 equals?

• Basic Math -

1/4 = 15/60
1/5 = 12/60

What do you think?

• Basic Math -

solve 5/30+3/40+1/8

• Basic Math -

what is 5/30 + 3/40 + 1/8

## Similar Questions

x-2 6x ____ - _____ 3x+4 x+1 *You are supposed to simplify the expresion.I really need help with this and some other problems.Please and Thank you.- Perhaps I could help but I can't make heads or tails of your posts. Try using parentheses …
2. ### Math

I still do not understand Today was my first day learning how to add 3 sets of fractions with different denominators and I did not get it. I need help with the following please. 1/8 + 1/2 + 3/4 = Waht is the LCM?
3. ### math

5/10+12/16+(15/20-4/16) Well you need to solve in the parentheses first, by making them common denominators. (15/20 - 4/16)=(60/80 - 20/80) Then subtract. (40/80) then simplify. (1/2) Next make all the fractions with common denominators. …
4. ### Math

How would I describe a step-by-step procedure for adding two fractions with different denominators?
5. ### Math Fractions

What is the first step to adding multiple fractions (3) with differenct denominators?
6. ### math

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

in what way is subtracting fractions with unlike denominators like adding fractions with unlike denominators?
8. ### Algebra 1-Fractions

Or, eliminating fractions, I should say. So, I need some help. See, I am really not a big fan of fractions. But I need to eliminate fractions to do a math problem. First one is 1/2-x=3/8. I know how to find LCD, then multiply both …
9. ### Math

Need help with adding subtracting decimals. In this unit, you learned about fractions that can be written as terminating decimals and fractions that can be written as nonterminating decimals. Create an addition word problem and a subtraction …
10. ### Math

Need help with adding subtracting decimals. In this unit, you learned about fractions that can be written as terminating decimals and fractions that can be written as nonterminating decimals. Create an addition word problem and a subtraction …

More Similar Questions