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Numbers & their Classifications

Terms in this set (11)

Integers
The set of whole positive and negative numbers, including zero. Integers do not include fractions (1/3), decimals (0.56), or mixed numbers (7 & 3/4's).
Prime Number
A whole number greater than 1 that has only two factors, itself and 1; that is, a number that can be divided evenly only by 1 and itself.
Composite Number
A whole number greater than 1 that has more than two different factors; in other words, any whole number that is not a prime number. For example the composite number 8 has factors of 1,2,4, & 8.
Even Number
Any integer that can be divided by 2 without leaving a remainder. For example: 2, 4, 6, 8 and so on.
Odd Number
Any integer that cannot be divided evenly by 2. For example: 3, 5, 7, 9 and so on.
Decimal Number
A number that uses a decimal to show the part of the number that is less than one. Example: 1.234.
Decimal Point
A symbol used to separate the ones place from the tenths place in decimals or dollars from cents in currency.
Decimal Place
The position of a number to the right of the decimal point. In decimal 0.123, the 1 is in the first decimal place to the right of the decimal point, indicating tenths; the 2 is in the second place, indicating hundredths, and the 3 is in the third decimal place, indicating thousandths.
Rational Numbers
Include all integers, decimals, and fractions. Any terminating or repeating decimal number is a rational number.
Irrational Numbers
Cannot be written as fractions or decimals because the number of decimal places is infinite and there is no recurring pattern of digits within the number. For example, pi begins with 3.141592 and continues without terminating or repeating, so pi is an irrational number.
Real Numbers
The set of all rational and irrational numbers.
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