In this activity, we will be learning how to identify the larger fraction.

**Which fraction is larger?**

**3/4 or 4/5?**

We can't compare these fractions at the moment because they have different denominators.

It would be like comparing 3 apples and 4 oranges!

So, the first thing we have to do is to make the denominators the same.

In other words, find a** common denominator**.

What's the** lowest common multiple** of 4 and 5?

It's **20**, so we'll make that our new **denominator**.

Now we need to look at what we did to each denominator to turn it into 20 and do the same thing to the numerator.

With **3/4**, we multiplied the 4 by 5 to make 20, so we need to multiply the 3 by 5 too.

This gives us **15/20**.

With **4/5**, we multiplied the 5 by 4 to make 20, so we need to multiply the 4 by 4 too.

This gives us **16/20.**

We now have **15/20** and **16/20**.

It is clear that 16/20 is larger than 15/20, so this means that 4/5 is larger than 3/4.

Now that we have a common denominator, we can do all sorts of things with these fractions, not just comparing, but also adding and subtracting.

So, all in all, a very useful skill to have!

Let's practise it in the following questions!