19/40 is in the reduced form as there is no whole number that divides 19 and 40 evenly (remainder zero).
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The reduced fraction for 40 over 100 is 2/5
it can be reduced to 4 over 3
19 over 40 is the same as 19 divided by 40: 19 ÷ 40 = 0.475
12/40 factor 4*3/4*10 eliminate 4; top and bottom 3/10
19/40 = 47.5%