Adding Fractions
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Say we want to add:

The denominator of the first fraction is 3. The denominator of the second fraction is 5. Because these 2 numbers are different, we need the lowest common denominator, which, in this case is 15 because 3 x 5 = 15. So we multiply:

and

We can do this because 5/5 = 1 and 3/3 = 1 and we know that multiplying a number by 1 doesn't change the number. Now we add:


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What is a fraction?
Adding fractions
Subtracting fractions
Multiplying fractions
Dividing fractions
Subtracting a fraction from a whole number
Multiplying a fraction and a whole number
Dividing a fraction and a whole number
What is a reciprocal?
Changing a fraction to a percentage
Changing a percentage to a fraction
Rounding to a whole number
Finding the lowest common denominator
Reducing a fraction
Euclidean Algorithm
Adding fractions
Subtracting fractions
Multiplying fractions
Dividing fractions
Subtracting a fraction from a whole number
Multiplying a fraction and a whole number
Dividing a fraction and a whole number
What is a reciprocal?
Changing a fraction to a percentage
Changing a percentage to a fraction
Rounding to a whole number
Finding the lowest common denominator
Reducing a fraction
Euclidean Algorithm
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