Decimal numbers are similar to fractions in basic principle.
They are often used as a way of writing a number that isn’t whole, a number that will contain a decimal point.
Take the mixed number  4, there is a whole number, and a fraction.
The whole number is 4, and the fraction, which is part of a whole number, is .
Likewise, with the decimal number 4.25.
The whole number is 4, and the decimal part is 0.25.
One can think in terms of money, cents are parts of a dollar, 100 cents make 1 full dollar.
If you have $3 and 55c, you have 3 full dollars, and 55 parts of another dollar.
Which looks like $3.55 as a decimal.
You don’t have a full $4, but you’re some of the way there, having more than $3.
Above is a basic introduction to the idea of numbers in decimal form, the
pages below delve into the topic Mathematically in more detail.
History of Decimals
if you would like to view some information on the history of decimals? A
good page with some handy information can be seen at the California
State University website, this page is linked just below.
- Decimal place value, infinite, repeating
A section covering decimal place value, along with explanations of infinite and repeating decimals.
- Rounding Decimals
Decimals can be rounded a certain place to make the number smaller or simpler.
- Adding and Subtracting Decimals
Like whole numbers, numbers in decimal form can be added and subtracted.
- Multiplication of Decimals
Multiplying decimals is quite similar to multiplying whole numbers.
- Division of Decimals
Section featuring a variety of examples of division involving decimals.
- Change Decimals to Fractions
Examples of how to approach changing various decimals to fractions.