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2. Fraction - Wikipedia

   en.wikipedia.org/wiki/Fraction

   Converting between decimals and fractions. To change a common fraction to a decimal, do a long division of the decimal representations of the numerator by the denominator (this is idiomatically also phrased as "divide the denominator into the numerator"), and round the answer to the desired accuracy.

3. Decimal representation - Wikipedia

   en.wikipedia.org/wiki/Decimal_representation

   Every decimal representation of a rational number can be converted to a fraction by converting it into a sum of the integer, non-repeating, and repeating parts and then converting that sum to a single fraction with a common denominator. For example, to convert ¯ to a fraction one notes the lemma:

4. Decimal - Wikipedia

   en.wikipedia.org/wiki/Decimal

   Decimal. Place value of number in decimal system. The decimal numeral system (also called the base-ten positional numeral system and denary / ˈdiːnəri / [1] or decanary) is the standard system for denoting integer and non-integer numbers. It is the extension to non-integer numbers ( decimal fractions) of the Hindu–Arabic numeral system.

5. Repeating decimal - Wikipedia

   en.wikipedia.org/wiki/Repeating_decimal

   So this particular repeating decimal corresponds to the fraction 1 / 10 n − 1, where the denominator is the number written as n 9s. Knowing just that, a general repeating decimal can be expressed as a fraction without having to solve an equation. For example, one could reason:

6. Duodecimal - Wikipedia

   en.wikipedia.org/wiki/Duodecimal

   Numeral systems. The duodecimal system, also known as base twelve or dozenal, is a positional numeral system using twelve as its base. In duodecimal, the number twelve is denoted "10", meaning 1 twelve and 0 units; in the decimal system, this number is instead written as "12" meaning 1 ten and 2 units, and the string "10" means ten.

7. Binary number - Wikipedia

   en.wikipedia.org/wiki/Binary_number

   A binary number is a number expressed in the base -2 numeral system or binary numeral system, a method of mathematical expression which uses only two symbols: typically "0" ( zero) and "1" ( one ). The base-2 numeral system is a positional notation with a radix of 2. Each digit is referred to as a bit, or binary digit.