Learning common formulae - fractions/reciprocals

1/n	1/n as %
1/1	100
1/2	50
1/3	33.33
1/4	25
1/5	20
1/6	16.66
1/7	14.28
1/8	12.5
1/9	11.11
1/10	10
1/11	9.09
1/12	8.33
1/13	7.69
1/14	7.14
1/15	6.66
1/16	6.25
1/17	5.88
1/18	5.55
1/19	5.26