COUNTING

COUNTING

in DECIMAL, BINARY, OCTAL and HEX

We use ten symbols in Decimal counting 0,1,2,3,4,5,6,7,8 and 9. There are two symbols used in Binary 0 and 1. There are eight symbols used in Octal 0,1,2,3,4,5,6 and 7. There are sixteen symbols used in Hex 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E and F.

In the table below cross out the numbers that do not belong in the Binary and Octal columns. Add the numbers that are missing in the Hex column.

DECIMAL has 10 symbols			BINARY does not use 2,3,4,5,6,7,8 and 9			OCTAL does not use 8 and 9			HEX has 16 symbols
1	21	41	1	21	41	1	21	41	1	15	29
2	22	42	2	22	42	2	22	42	2	16	......
3	23	43	3	23	43	3	23	43	3	17	......
4	24	44	4	24	44	4	24	44	4	18	......
5	25	45	5	25	45	5	25	45	5	19	......
6	26	46	6	26	46	6	26	46	6	......	......
7	27	47	7	27	47	7	27	47	7	......	......
8	28	48	8	28	48	8	28	48	8	......	30
9	29	49	9	29	49	9	29	49	9	......	31
10	30	50	10	30	50	10	30	50	......	......	32
11	31	51	11	31	51	11	31	51	......	......	33
12	32	52	12	32	52	12	32	52	......	20	34
13	33	53	13	33	53	13	33	53	......	21	35
14	34	54	14	34	54	14	34	54	......	22	36
15	35	55	15	35	55	15	35	55	......	23	37
16	36	56	16	36	56	16	36	56	10	24	38
17	37	57	17	37	57	17	37	57	11	25	39
18	38	58	18	38	58	18	38	58	12	26
19	39	59	19	39	59	19	39	59	13	27
20	40	60	20	40	60	20	40	60	14	28