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Number Notation

Decimal Numbers

100                       one hundred
1,000                     one thousand
10,000                    ten thousand
100,000                   one hundred thousand
1,000,000                 one million
1,000,000,000             billion= a thousand millions
1 with 12 zeros           trillion
1 with 15 zeros           quadrillion
1 with 18 zeros           quintillion
1 with 21 zeros           sextillion
1 with 24 zeros           septillion
1 with 27 zeros           octillion
1 with 100 zeros          googol
1 with a google of zeros  googolplex

Fractions

0.1     tenth               1/10
0.01    hundredth           1/100
0.001   thousandth          1/1000
0.0001  ten thousandth      1/10000
0.00001 hundred thousandth  1/100000

Number Base Systems

Decimal(10)	Binary(2)	Ternary(3)	Octal(8)	Hexadecimal(16)
0	0	0	0	0
1	1	1	1	1
2	10	2	2	2
3	11	10	3	3
4	100	11	4	4
5	101	12	5	5
6	110	20	6	6
7	111	21	7	7
8	1000	22	10	8
9	1001	100	11	9
10	1010	101	12	A
11	1011	102	13	B
12	1100	110	14	C
13	1101	111	15	D
14	1110	112	16	E
15	1111	120	17	F
16	10000	121	20	10
17	10001	122	21	11
18	10010	200	22	12
19	10011	201	23	13
20	10100	202	24	14

SI (International System of Units) Prefixes

Number	Prefix	Symbol
10 ¹	deka-	da
10 ²	hecto-	h
10 ³	kilo-	k
10 ⁶	mega-	M
10 ⁹	giga-	G
10 ¹²	tera-	T
10 ¹⁵	peta-	P
10 ¹⁸	exa-	E
10 ²¹	zeta-	Z
10 ²⁴	yotta-	Y

Number	Prefix	Symbol
10 ^-1	deci-	d
10 ^-2	centi-	c
10 ^-3	milli-	m
10 ^-6	micro-	u (greek mu)
10 ^-9	nano-	n
10 ^-12	pico-	p
10 ^-15	femto-	f
10 ^-18	atto-	a
10 ^-21	zepto-	z
10 ^-24	yocto-	y

Roman Numerals

1 = I		11 = XI     21 = XXI
2 = II		12 = XII    25 = XXV
3 = III		13 = XIII   30 = XXX
4 = IV		14 = XIV    40 = XL
5 = V		15 = XV     41 = XLI
6 = VI		16 = XVI    49 = XLIX
7 = VII		17 = XVII   50 = L
8 = VIII		18 = XVIII  51 = LI
9 = IX		19 = XIX    60 = LX
10 = X		20 = XX     70 = LXX
			   80 = LXXX
			   90 = XC
			   91 = XCI
			   99 = XCIX