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In this section we have a look at numbers – Integers, Even and Odd numbers, Decimal Places, Prime Numbers, Rounding Numbers, Cardinal, Ordinal, Nominal Numbers, and Roman Numerals.
Integers include positive whole numbers, negative whole numbers, and zero.
Even and Odd Numbers
Even numbers are numbers that can be divided evenly by 2. Even numbers can be shown as a set like this:
Decimal Places
One decimal place to the left of the decimal point is the ones place. One decimal place to the right of the decimal place is the tenths place.
Prime Numbers
A prime number can be divided, without a remainder, only by itself and by 1. For example, 17 can be divided only by 17 and by 1.
Rounding Numbers
A rounded number has about the same value as the number you start with, but it is less exact.
Cardinal, Ordinal, and Nominal Numbers
A cardinal number tells "how many." Cardinal numbers are also known as "counting numbers," because they show quantity.
Roman Numerals
Roman numerals are expressed by letters of the alphabet:

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