In adding and subtracting fractions with unlike denominators, you have to get a least common denominator which is exactly like the least common multiple it just so happens to be in the denominator.

Back to top Activity: Adding and subtracting fractions with different denominators Complete this activity to learn how to add and subtract fractions with different denominators and then put your ...

Now the denominators ... short animated film on adding and subtracting fractions is from the BBC Teach series, Hyaptia's Mathematical Maze. BBC Teach has thousands of free, curriculum-linked ...