You can subtract the bigger fraction by the smaller fraction and then put a minus sign in front of the answer.
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if you want to subtract a bigger number from a smaller one, first subtract smaller number from bigger one add negative sign in front of answer you got
The bigger the denominator(lowest) the smaller the fraction
You don't
8/20-15/20=7/20
If you want to subtract a smaller number from a bigger number then just subtract. For example: 14 - 12 = 2 and etc. (more but it is going to be too long) 15 - 13 = 2 16 - 14 = 2