Are you really that stupid? use a calculator! or even better... YOUR HEAD! :O
-_-
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It is: 1 and 1/6 minus 2/3 = 1/2 in its simplest form
5 over 6 minus 2 in simplest form equals -1 1/6
Expressed as a mixed number in its simplest form, -1.9 is equal to -1 9/10 or minus one and nine tenths.
It is: 7/8 minus 1/8 = 6/8 => 3/4 in its simplest form
1/4 − 1/20 in simplest form = 1/5