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Suppose you had the sum 3/4+1/8-5/6. First - make the fractions all the same... 3/4 = 6/8, so 6/8+1/8=7/8.

Next, you want to subtract 5/6. Again - make everything have the same denominator, so... 7/8 (from the previous sum) equals 21/24, and 5/6=20/24.

This gives you the final sum 21/24-20/24=1/24

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โˆ™ 2010-12-16 20:27:57
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Q: How do you add two fractions together then subtract another?
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Related questions

What you need to add or subtract fractions?

You need a common denominator in order to add or subtract fractions.


How do you add and subtract dissimilar fractions?

Make the fractions equivalent then subtract


How do you add and subtract fractions with the same denominator?

it stay the same when you subtract fractions and when you add fractions.


Do you add and subtract like and unlike fractions in the same way?

no, to add and subtract like and unlike fractions the denominator has to be the same,


How do you add two fractions that have like denominators?

In fractions, you can NEVER add or subtract


Why are two fractions converted into like fractions?

Because you can't add or subtract fractions that have different denominators. Making them like fractions, by multiplying so the denominators are the same, you can add and/or subtract them.


What are the advantages of writing fractions in deciamal form?

Fractions in decimal form are easy to compare and to add and subtract from one another.


What is the requirement to add or to subtract fractions?

The denominator (bottom number) must be the same for all the fractions being added or subtracted together.


To add and subtract fractions less than 1 you add or subtract only the what?

Numerators


Why do you find common denominators?

In order to add or subtract one fraction from another, they must have a common denominator, or the same denominator. That's because it's impossible to add two fractions that have a different number of parts.


Is it important to know how to add and subtract fractions why?

it is important to learn how to add and subtract fractions because we can use it when a time comes , when we have our own business and others .


When you add or subtract fractions with unlike denominators why do you have to find LCM?

Because to add fractions, the denominators must be equal.


When you add and subtract fractions can the answer be a mixed number?

Yes.


How do you add and subtract by fractions?

If the fractions have the same denominator, add and subtract the numerators as if the denominators weren't there and put the result over that denominator. Reduce if possible. If the fractions have different denominators, find the LCM of the denominators and convert the fractions to equivalent fractions with like denominators. Then add and subtract the numerators as if the denominators weren't there and put the result over that denominator. Reduce if possible.


How are lcm's used in adding or subtracting fractions?

To add and subtract fractions, you need common denominators. To find the common denominator, take the LCM of the denominators you wish to add or subtract.


How are fractions under addition?

In order to add or subtract fractions, they must have the same denominator.


How do you add or subtract fractions when negative?

The same as with positive ones. Make sure they have the same denominator and add or subtract their numerators.


How is finding the LCM revelant when adding and subtracting fractions?

To add and subtract fractions, you need common denominators. To find the common denominator, find the LCM of the denominators you wish to add or subtract.


Why do fractions need to have a common denominator before add or subtract them?

because it would be diffcult to understand.[you don't add or subtract the demonters]


What do you not have to think about when you add or subtract fractions?

Whether the denominators are common or not.


When does the LCM come in handy?

When you want to add or subtract fractions.


Do you need to add whole numbers when subtracting fractions?

add? dont you mean subtract?


How do you subtract mixed numbers with regrouping?

you take away one of the whole number=then you add or subtract your fractions=


How would you add or subtract fractions with like denominators?

The same way you would add or subtract whole numbers, leaving the denominators alone.


Why is finding the greatest common factor is useful for fractions?

It allows you to add and subtract the fractions with greater ease.