How to add and subtract improper fractions?

First make the fractions to be added to have the same denominatoer. Adding improper fractions with similar denominators is easy. Simply add the numeratoer and retain the denominator....say 11/7 + 12/7 = 23/7.

For dissimilar denominator, you have to find the least common factor for the 2 denominators to make them similar. This is little tricky compared to the other. Lets have 4/3 + 7/5 as example here.

You have to look for the LCD... look for a number that can divide for 3 and five and that number must be the smallest possible. Say 15... convert the two fractions to make both the denominator 15. To convert 4/3 to have a 15 denom, divide 15 by 3 and multiply by 4 to get the numerator which is 20.

Now, the new fraction is 20/15 for 4/3. Convert the other addend which is 7/5. DO similar procedure.

Divide 15 by 5 and multiply by 7. This will give us the second fraction's numerator which is 21. You have 21/15 now.

Now there is a common denominator which is 15. Now you can perform the ... more.

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