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Tables and cheat sheets

Times table, squares and roots, SI prefixes and a set of formulas.

A set of tables to glance at instead of calculating: the times table, squares, cubes and roots, the SI prefixes and the conversion factors needed most often. The remaining tables sit in the topic sections.

Tables and cheat sheets

Times table

the diagonal holds the square numbers

×	1	2	3	4	5	6	7	8	9	10
1	1	2	3	4	5	6	7	8	9	10
2	2	4	6	8	10	12	14	16	18	20
3	3	6	9	12	15	18	21	24	27	30
4	4	8	12	16	20	24	28	32	36	40
5	5	10	15	20	25	30	35	40	45	50
6	6	12	18	24	30	36	42	48	54	60
7	7	14	21	28	35	42	49	56	63	70
8	8	16	24	32	40	48	56	64	72	80
9	9	18	27	36	45	54	63	72	81	90
10	10	20	30	40	50	60	70	80	90	100

Squares, cubes and roots

n	n²	n³	√n	∛n
1	1	1	1	1
2	4	8	1.4142	1.2599
3	9	27	1.7321	1.4422
4	16	64	2	1.5874
5	25	125	2.2361	1.71
6	36	216	2.4495	1.8171
7	49	343	2.6458	1.9129
8	64	512	2.8284	2
9	81	729	3	2.0801
10	100	1000	3.1623	2.1544
11	121	1331	3.3166	2.224
12	144	1728	3.4641	2.2894
13	169	2197	3.6056	2.3513
14	196	2744	3.7417	2.4101
15	225	3375	3.873	2.4662
16	256	4096	4	2.5198
17	289	4913	4.1231	2.5713
18	324	5832	4.2426	2.6207
19	361	6859	4.3589	2.6684
20	400	8000	4.4721	2.7144
21	441	9261	4.5826	2.7589
22	484	10648	4.6904	2.802
23	529	12167	4.7958	2.8439
24	576	13824	4.899	2.8845
25	625	15625	5	2.924

Handy conversions

the values people most often need to check in a hurry

Z	To	Factor
1 inch	centimeters	2,54
1 foot	centimeters	30,48
1 statute mile	kilometers	1,609
1 pound	kilograms	0,4536
1 ounce	grams	28,35
1 US gallon	liters	3,785
1 hectare	square meters	10 000
1 kilowatt-hour	kilojoules	3 600
1 kilocalorie	kilojoules	4,184
100 kilometers per hour	meters per second	27,78
0 °C	degrees Fahrenheit	32
100 °C	degrees Fahrenheit	212

The most common fractions

the same set as in the Percentages section — for a quick look

Fraction	Percentage	Decimal
1/2	50%	0.5
1/3	33.33%	0.333333
2/3	66.67%	0.666667
1/4	25%	0.25
3/4	75%	0.75
1/5	20%	0.2
2/5	40%	0.4
3/5	60%	0.6
4/5	80%	0.8
1/6	16.67%	0.166667
5/6	83.33%	0.833333
1/8	12.50%	0.125
3/8	37.50%	0.375
5/8	62.50%	0.625
7/8	87.50%	0.875
1/10	10%	0.1
1/16	6.25%	0.0625
1/20	5%	0.05

×	1	2	3	4	5	6	7	8	9	10
1	1	2	3	4	5	6	7	8	9	10
2	2	4	6	8	10	12	14	16	18	20
3	3	6	9	12	15	18	21	24	27	30
4	4	8	12	16	20	24	28	32	36	40
5	5	10	15	20	25	30	35	40	45	50
6	6	12	18	24	30	36	42	48	54	60
7	7	14	21	28	35	42	49	56	63	70
8	8	16	24	32	40	48	56	64	72	80
9	9	18	27	36	45	54	63	72	81	90
10	10	20	30	40	50	60	70	80	90	100

×	1	2	3	4	5	6	7	8	9	10
1	1	2	3	4	5	6	7	8	9	10
2	2	4	6	8	10	12	14	16	18	20
3	3	6	9	12	15	18	21	24	27	30
4	4	8	12	16	20	24	28	32	36	40
5	5	10	15	20	25	30	35	40	45	50
6	6	12	18	24	30	36	42	48	54	60
7	7	14	21	28	35	42	49	56	63	70
8	8	16	24	32	40	48	56	64	72	80
9	9	18	27	36	45	54	63	72	81	90
10	10	20	30	40	50	60	70	80	90	100

×	1	2	3	4	5	6	7	8	9	10
1	1	2	3	4	5	6	7	8	9	10
2	2	4	6	8	10	12	14	16	18	20
3	3	6	9	12	15	18	21	24	27	30
4	4	8	12	16	20	24	28	32	36	40
5	5	10	15	20	25	30	35	40	45	50
6	6	12	18	24	30	36	42	48	54	60
7	7	14	21	28	35	42	49	56	63	70
8	8	16	24	32	40	48	56	64	72	80
9	9	18	27	36	45	54	63	72	81	90
10	10	20	30	40	50	60	70	80	90	100