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.

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

Another sticking point for many students is adding fractions with different denominators—for example, coming up with 11/12 when asked to add 3/5 and 8/7.

Fractions are a foundational piece for tackling mathematics at all levels of schooling. Students need to understand how two numbers interact with each other as numerators and denominators, as ...

In math, students advance to work with decimals up to the hundreds place. Students add, subtract, and multiply fractions, including fractions with different denominators. They expand their ...