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.

Have you ever tried to add or subtract fractions that have different denominators? It’s tricky, right? Join Ms. Susanna Post in this lesson to learn how to solve these types of challenging ...

But it turns out that the conclusions they draw in that video are literally correct. You can add an infinite series of positive numbers, and they’ll add up to a negative fraction.