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数字符号

十进制数字

100                       一百
1,000                     一千
10,000                    一万
100,000                   十万
1,000,000                 一百万
1,000,000,000             十亿= a thousand millions
1 with 12 zeros           万亿
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

分数

0.1     十分之一               1/10
0.01    百分之一           1/100
0.001   千分之一          1/1000
0.0001  万分之一      1/10000
0.00001 十万分之一  1/100000

数字进制系统

十进制(10)	二进制(2)	三进制(3)	八进制(8)	Hexa十进制(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 (国际单位制) 前缀

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

罗马数字

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