Arabic numerals

Arabic AR uh bihk, numerals, also called Hindu-Arabic numerals, are the most common symbols used... More >>

Billion

Billion is a thousand million. One billion is written 1,000,000,000. This is the standard... More >>

Decillion

Decillion, dih SIHL yuhn, is a thousand nonillions, or a unit with 33 zeros, in the United States... More >>

Decimal system

Decimal system is a way of writing numbers. Any number, from huge quantities to tiny fractions,... More >>

Duodecimal system

Duodecimal, doo uh DEHS uh muhl, system is a way of grouping numbers based on 12 instead of 10,... More >>

Googol

Googol, GOO gol, is the number written as 1 followed by 100 zeros, or 10 to the power of 100. A... More >>

Million

Million is a thousand 1,000's. One million is written 1,000,000. An idea of the size of a million... More >>

Nonillion

Nonillion, noh NIHL yuhn. In the United States and France, nonillion is a thousand octillions, or... More >>

Number and numeral

Number and numeral. A number is an idea that is used to refer to amounts of things. People use... More >>

Number theory

Number theory is the branch of mathematics concerned with the properties of the natural numbers... More >>

Numeration systems

Numeration systems are ways of counting and of naming numbers. They are also called numeral... More >>

Octillion

Octillion, ok TIHL yuhn. In France and the United States, an octillion is 1 followed by 27 zeros.... More >>

Power

Power, in arithmetic, is the product of a number multiplied by itself a specified number of... More >>

Rational number

Rational, RASH uh nuhl, number is any number that can be expressed in the form a/b, where a is... More >>

Roman numerals

Roman numerals are a set of symbols that stand for numbers. The ancient Romans invented Roman... More >>