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.

Learning with TOI News: Fractions, often perceived as daunting, become manageable with the right approach. Addition and subtraction require finding a common denominator, whil ...

Revise how to add, subtract, multiply and divide fractions, how to use a calculator for fractions and how to find fractions of amounts in this GCSE maths guide.

Use visual fraction models to add and subtract fractions with the same denominators.