Names of small numbers

Naming very small numbers is the same as naming very big numbers, but with one important difference. There is a minus sign over what the 10 in the formula is raised to. So if one wanted to write 0.007 in shorthand form, they would write it 7 x 10⁻³ since 7 is the third digit after the decimal point (the zero in front of the decimal point does not count). Naming a very small number with lots of different numbers inside it is the same as doing it with a very big number, but again with that one difference of the minus sign. So 0.0000452 would become 4.52 x 10⁻⁵ (0.0000452 --> 4.52 x 0.00001 --> 4.52 x 10⁻⁵).

Some examples

0.00000000009	=	9 x 10−11
0.000678	=	6.78 x 10−4
0.000000535645	=	5.35645 x 10−7

Names of small numbers

	English name	European name
100	One	One
10−1	Tenth	Tenth
10−2	Hundredth	Hundredth
10−3	Thousandth	Thousandth
10−4	Ten Thousandth	Ten Thousandth
10−5	Hundred Thousandth	Hundred Thousandth
10−6	Millionth	Millionth
10−9	Billionth	Milliardth
10−12	Trillionth	Billionth
10−15	Quadrillionth	Billiardth
10−18	Quintillionth	Trillionth
10−21	Sextillionth	Trilliardth
10−24	Septillionth	Quadrillionth

Related pages

• Names of large numbers

Other websites

• Names of large and small numbers Archive copy at the Internet Archive