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18/36, 27/36, and 36/36, because you already know % number of 1/4 (=9/36),
1/2 (=18/36), 3/4 (=27/36), and 1 (=36/36.) Numbers you really have
to memorize are eight at most, from 1/36 to 8/36.
Since 23 is 18 + 5, the fraction 23/36 is also 18/36 + 5/36. We have already known % value of 18/36 and 5/36, 50.00% and 13.88% respectively, and 23/36 can be calculated as 63.88% by addition of them.
In general , a numerator of any "not colored" columns in the table is
an addition of % value of 9/36, 18/36 or 27/36 and 1/36~8/36, and you can
get % value of n/36 by just adding numbers you have memorized.








































































Because 4/36 is 11.11% that is very easy number to multiply, you can get the result quickly by using this characteristic when n of n/36 is an integral multiple of 4 (8, 12, 16, 20, 24, 28, and 32.)
Example: 24/36
Since 24 is 6 times 4, 24/36 is 11.11% times 6, that is 66.66%.