Types of Decimal Numbers

Exact Decimal

The decimal part of an exact decimal number is composed of a finite number of digits.

Exact Decimal

Repeating Decimal or Recurring Decimal

1

The decimal part, called the period, is repeated endlessly.

Repeating Decimal

2

The decimal part is composed of an irregular part and a regular part, also known as a period.

Recurring Decimal

Not Exact and Non-Recurrent

Non-Recurrent Decimal


Given a fraction, its decimal number can be calculated by taking the denominator and decomposing it into factors.

If the denominator has a factor of only 2, or only 5, or 5 and 2; the fraction is decimal exact.

Decimal Exact Fractions

If the denominator does not have a factor of 2 or 5, the fraction is a repeating decimal of the first type.

Repeating Decimal Fractions

If the denominator has factors other than 2 or 5, the fraction is a repeating decimal of the second type.

Repeating Decimal Fractions