English is ten (ten) and ten (ten).

Carry decimal 10.

Minimum even number and minimum composite number of two digits.

The fourth triangular number.

Because 10 is easy to calculate, many units with the same length (meters) and weight (grams) are decimal. Most currencies in the world adopt the decimal system (Britain and some other Commonwealth countries later evolved the decimal system). For example, 1 yuan equals 10 minute, and 1 minute equals 10 minute.

10= 1+32 is decomposed into the sum of squares of two different odd numbers and is the smallest positive integer satisfying this property.

Logarithm with the base of 10 is often used in astronomy, and it is recorded as lg.

Scientific notation: mathematical term, in the form of a× 10 to the power of n, a number is expressed as (a×/kloc-0 to the power of n), where 1 ≤| a | < 10, where n represents an integer, which is called scientific notation.