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## Joe Della Peruti

on 21 October 2013

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#### Transcript of Adding and Subtracting Fractions

By Joe, Abigail, Lauren
and Andee

1. Find the smallest multiple (LCM) of both numbers.
2. Rewrite the fractions as equivalent fractions with the L.C.M as the denominator.
Example:
3/4+1/6= 9/12+2/12= 11/12
Subtracting Negative Fractions
Subtracting Positive Fractions
Find the least common denominator of the two fractions.
Multiply the numerator by the number you used to find the least common denominator. ex: 3/4 - 2/8
Both denominators should become 8
Since 4 * 2 = 8 You will multiply 3 * 2 which equals 6
Do the same with the second fraction
Now just subtract the two numerators, and borrow if needed.
Simplify if needed
Ex: 4 1/6 - 3 2/3
1. Change it to 3 1/6 - 3 4/6
2. In this example you need to borrow, to borrow you take one whole number from the number in front of the fraction. 3 1/6 becomes 3 7/6.
3. Now just subtract: 3 7/6 - 3 1/6 = 6/6
4. Simplify if needed: 6/6 = 1
If The problem you have does not require borrowing then just skip that step.