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Learn about the history and usage of different symbols to separate the integer and fractional parts of a decimal number, such as period, comma, and full stop. Compare the practices in various countries, regions, and contexts, such as mathematics, computing, and language.
A decimal is a number written in the decimal system, which uses ten digits and a decimal mark to represent integers and fractions. Learn how decimals are formed, how they are used to approximate real numbers, and how they relate to other numeral systems.
A fraction is a number that represents a part of a whole or a number of equal parts. The denominator is the number of parts in a whole, and the numerator is the number of parts in a fraction. Learn about different forms, operations and applications of fractions.
A binary number is a number expressed in the base-2 numeral system, using only two symbols: 0 and 1. Learn about the origins and applications of binary numbers in various cultures and fields, from ancient Egypt and China to modern computers and cryptography.
Rounding is replacing a number with an approximate value that has a shorter, simpler, or more explicit representation. Learn about different rounding methods, such as directed rounding, rounding to integer, rounding to nearest, and rounding to even, and see how they affect calculations and results.
A finite decimal is a decimal representation of a non-negative real number that ends in zeros or nines. Learn how to convert finite decimals to fractions, and how to distinguish them from infinite and repeating decimals.
A repeating decimal is a decimal representation of a number whose digits are eventually periodic. Learn the definition, examples, notation and properties of repeating decimals, and how they differ from terminating and irrational decimals.
Quinary is a place-value notation system that uses five digits, from 0 to 4, to represent any real number. Learn about the history, properties, comparison and applications of quinary, and see examples of numbers and fractions in quinary.