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To add or subtract fractions the denominators must be the same - then the numerators are added or subtracted with the denominator being kept the same.

When adding or subtracting fractions with different denominators, the fractions must first be converted into equivalent fractions with the same denominator and then the (new) numerators can be added or subtracted as required.

For the denominator for these equivalent fractions, the original denominators can all be multiplied together, but this can lead to having to work with very large numbers; a better choice for the denominator is the smallest number that all the denominators divide into, their Least Common Multiple (LCM) - this is is then used as the denominator for the equivalent fractions and is called the Least Common Denominator (LCD) of the fractions.

First you find the LCD okay??? Then you have to add or subtract. What they mean by that is that once you've found your lcd add or subtract..xx hope i helped :)

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Q: Find the LCD then add or subtract?

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Once you find the LCD, convert the fractions to their equivalents and then you can add and/or subtract them correctly.

Neither. Factorise and then multiply a subset of factors.

Find theLeast Common Denominator (LCD)Find the equivalent fractions.Add or subtract the fractions and add or subtract the whole numbers.Write your answer in lowest terms.

subtract? Find a common denominator (LCD is preferred). Convert each fraction to an equivalent fraction with the LCD. Add numerators, keep LCD as new denominator. Reduce the fraction.

Subtract the largest data with lowest data

In order to subtract or add fractions the denominators must be the same and that's why the LCD must be found.

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.

deposit = add withdraw = subtract

Possible reasons: To add or subtract fractions, To compare fractions with different denominators.

subtract

How do you add or subtract energy?

To find the larger side you add the 2 legs together, for the smaller sides you subtract the other 2 legs :)

The answer depends on what you know and what you are trying to find.

or else you cannot add or subtract them

the new denominator

It's something that you find to add and subtract fractions

You add or subtract only the numerators

You have to add the additive inverse. To subtract q, you add -q.

it means to subtract

When you want to add or subtract fractions and need to find a common denominator.

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.

By the signs: 2+2(Add) 2-2(Subtract) +=add -=subtract

Yes, you can add or subtract under the radical.

Because to add fractions, the denominators must be equal.

You will need to find the LCM in order to add and subtract fractions.