What are Decimal Numbers?
A decimal number is the number between two whole numbers, and we write them by putting a point after the units. The numbers after the point are called decimals, and they have some special names.
We can see where these names come from by looking at a number line, where our usual number line with whole numbers looks like this:
If we zoom in between 3 and 4, we can see that it takes 10 steps to get from 3 to 4. These are our decimals that we call tenths.
If we zoom in between 3.4 and 3.5, we can see that it takes 10 steps to get from 3.4 to 3.5. Because we have already split this up into 10 and we are splitting it into 10 again, we get 10\times10=100. Which is why we call them hundredths!
We can actually keep on zooming in to get thousandths, millionths, ten millionths, and so on forever!!! So, really, we can count them up just like whole numbers.
To learn more about identifying the value of each digit up to 3 decimal places, click here.
To learn more about adding decimal numbers, click here.
To learn more about subtracting decimal numbers, click here.