Serial decimal is another term used for a repeating decimal number. It is called a serial decimal because it repeats in a pattern. Let's imagine we have ten slices of pizza to share among two people, which means each person gets 5 slices of pizza. But, what if we want to share the ten slices of pizza with three people? Here comes the serial decimal.
If we divide the ten slices of pizza between three people, each person will get 3 slices of pizza and there will be one slice left over. But we can't divide that last slice between three people. So, we need to find a way to express this as a number. The number will have a pattern, which we call "serial decimal."
When we do the division, we will have a decimal number that goes on forever. It looks like this: 0.3333333... And it keeps going like that forever. We can show this repeating pattern by writing a bar over the top of the numbers that repeat. So, our serial decimal is 0.3 with a bar over it. This is a way to express a repeating decimal in a simple and easy way so that everyone can understand it.