First you have to multiply the bigger fraction so that the denominator is the same. So 2/3 and 1/12 must be converted to a common denominator so 2 x 4 = 8/12
3 x 4 so 8/12 (same as 2/3) - 1/12 = 7/12 (cannot be cancelled down)
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Expressed as a proper fraction in its simplest form, 2/3 - 7/12 = 1/12 or one twelfth.
One minus one third is two thirds. 1=3/3 3/3-1/3=2/3
1/2
3 minus 2/3 is 2 1/3
5/3 minus 1/2 is 1 1/6