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:

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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