Mathematical table 

x*y	1	2	3	4	5	6	7	8	9	10	11	12
1	1	2	3	4	5	6	7	8	9	10	11	12
2	2	4	6	8	10	12	14	16	18	20	22	24
3	3	6	9	12	15	18	21	24	27	30	33	36
4	4	8	12	16	20	24	28	32	36	40	44	48
5	5	10	15	20	25	30	35	40	45	50	55	60
6	6	12	18	24	30	36	42	48	54	60	66	72
7	7	14	21	28	35	42	49	56	63	70	77	84
8	8	16	24	32	40	48	56	64	72	80	88	96
9	9	18	27	36	45	54	63	72	81	90	99	108
10	10	20	30	40	50	60	70	80	90	100	110	120
11	11	22	33	44	55	66	77	88	99	110	121	132
12	12	24	36	48	60	72	84	96	108	120	132	144

To find 7*8, you'd look left to seven, then down to eight. The answer is 56.

Tables of trigonometric functions were first known to be made by Hipparchus, and were used up until the 1980s when calculators included this functionality. Tables of logarithms and antilogarithms were used to perform tasks such as exponentiation, and sometimes as a short-cut for multiplication. Other tables are still commonly used, particularily in statistics, such as for normalized Gaussian distribution.

Creating tables is a common code optimization technique, and works as well for computers as humans.

Also see truth tables.

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