What is the sum of 5.4 and 3.2?

The sum of 5.4 and 3.2 is 8.6.

To find the sum of two numbers, you simply add them together. In this case, we are adding 5.4 and 3.2. When adding decimal numbers, it is important to line up the decimal points to ensure accuracy.

Let's break it down step by step:
1. Write the numbers vertically, aligning the decimal points:
```
5.4
+ 3.2
```
2. Add the numbers column by column, starting from the rightmost digit. Here, you add 4 and 2, which equals 6. Write 6 in the same column.
3. Move to the next column to the left, which contains the whole numbers. Add 5 and 3, which equals 8. Write 8 in the same column.

So, when you add 5.4 and 3.2, you get 8.6. This method ensures that you correctly account for the place value of each digit, which is crucial when working with decimals.

Understanding how to add decimal numbers is a fundamental skill in GCSE Maths, as it applies to various real-life situations, such as handling money, measuring distances, and analysing data. Practising this skill will help you become more confident in your mathematical abilities.