12/40
factor
4*3/4*10
eliminate 4; top and bottom
3/10
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19/40 is in the reduced form as there is no whole number that divides 19 and 40 evenly (remainder zero).
12 / 4 = 3 40 / 4 = 10 Answer being: 3 over 10 (3/10)
The reduced fraction for 40 over 100 is 2/5
it can be reduced to 4 over 3
189 and 40 have no factor in common and so the fraction cannot be reduced.