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.

The common denominator model, while not really a picture, demonstrates that the same rules apply to multiplication and division with fractions. It also shows why “invert and multiply” works.

Fractions, often perceived as daunting, become manageable with the right approach. Addition and subtraction require finding a common denominator, while multiplication involves directly multiplying ...

Learn activities for fourth grade math to prepare for school. Teach your children 4th grade math skills like fractions, multiplication and division.

Find out how to add and subtract fractions with matching and different denominators in this Year 6 article from BBC Bitesize.