Sunday, June 8, 2014

How to Subtract Fractions with Different Denominators


Subtracting fractions with different denominators is the same thing as adding the fractions.
The first thing you will do is write the equation like this 4/5 - 1/2.
Next you have to find the least common multiple (LCM) of the two denominators, and in this case it will 10 since 2x5=10 for 1/2's denominator and 5x2=10 for 4/5's denominator.
So now you have to find the numerators and to do this you will have to multiply the numerators with number used to find the LCM. So you will do 4x2=8 since you did 5x2=10, and you will do 1x5=5 since you did 2x5=10.At the end you should get an equation of 8/10 - 5/10.
And we all know that 8-5 is 3 and we will use the same denominator and so our answer will be 3/10.
Now try some of these and make sure to watch the video on YouTube.

Sheet 1 Practice Problems on Subtracting Fractions

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