Beyond Counting to 10

Introduction

Counting

Convert

Famous

Counting

Note: for number bases greater than 10, we'll run out of digits. So after '9' we start using the upper-case letters of the alphabet:

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, ...

Occasionally computers use base 64 (!!). To have enough 'digits' we add the lower case alphabet (a-z) and two symbols:

ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/

Decimal	Base 2	Base 3	Base 4	Base 5	Base 6	Base 7	Base 8	Base 9	Base 10	Base 11	Base 12	Base 13	Base 14	Base 15	Base 16
1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
2	10	2	2	2	2	2	2	2	2	2	2	2	2	2	2
3	11	10	3	3	3	3	3	3	3	3	3	3	3	3	3
4	100	11	10	4	4	4	4	4	4	4	4	4	4	4	4
5	101	12	11	10	5	5	5	5	5	5	5	5	5	5	5
6	110	20	12	11	10	6	6	6	6	6	6	6	6	6	6
7	111	21	13	12	11	10	7	7	7	7	7	7	7	7	7
8	1000	22	20	13	12	11	10	8	8	8	8	8	8	8	8
9	1001	100	21	14	13	12	11	10	9	9	9	9	9	9	9
10	1010	101	22	20	14	13	12	11	10	A	A	A	A	A	A
11	1011	102	23	21	15	14	13	12	11	10	B	B	B	B	B
12	1100	110	30	22	20	15	14	13	12	11	10	C	C	C	C
13	1101	111	31	23	21	16	15	14	13	12	11	10	D	D	D
14	1110	112	32	24	22	20	16	15	14	13	12	11	10	E	E
15	1111	120	33	30	23	21	17	16	15	14	13	12	11	10	F
16	10000	121	100	31	24	22	20	17	16	15	14	13	12	11	10
17	10001	122	101	32	25	23	21	18	17	16	15	14	13	12	11
18	10010	200	102	33	30	24	22	20	18	17	16	15	14	13	12
19	10011	201	103	34	31	25	23	21	19	18	17	16	15	14	13
20	10100	202	110	40	32	26	24	22	20	19	18	17	16	15	14
21	10101	210	111	41	33	30	25	23	21	1A	19	18	17	16	15
22	10110	211	112	42	34	31	26	24	22	20	1A	19	18	17	16
23	10111	212	113	43	35	32	27	25	23	21	1B	1A	19	18	17
24	11000	220	120	44	40	33	30	26	24	22	20	1B	1A	19	18
25	11001	221	121	100	41	34	31	27	25	23	21	1C	1B	1A	19