Fractions can be added in different ways: When fractions have the same denominator close denominatorNumber written on the bottom of a fraction. The denominator is the number of equal parts. Eg ...

There's a helpful shortcut worth remembering: if your fractions already share the same denominator, you can skip straight to adding or subtracting the numerators. No LCD hunting required.

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

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.

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 ...

Why do you need to find the lowest common denominator when adding or subtracting fractions but not when multiplying them? And why do you have to invert the second fraction and multiply when dividing?