# Multiplying Decimals Animations

## How to Multiply Decimals

Multiplying decimals starts with normal multiplication (ignoring decimal points).

Then the trick is to make sure the **answer** has as many decimal places as the **two original numbers combined**.

See the animation (press the play button):

We had to put the decimal point **3 places along**.

Note how I put the longer number on top (the one with the most digits) ... this made it easier to do the multiplication.

Here is another example, using long multiplication:

We had to put the decimal point **5 places along**, but there were only 4 digits, so that meant we had to insert another zero.

## Zeros at the end

What if there are zeros at the end? **Keep them there while you work out where to put the decimal point.**

BUT when we we write down the final answer we can leave off any zeros at the end (unless we are asked to keep them there), like this:

In that example the decimal points were put in **after** the multiplication, it doesn't matter which way we do it so long as we remember to count the correct number of places.

Quiz: