18/42
factor out a 6
6*3/6*7
as the factor 6 appears in both numerator and denominator it can be canceled
3/7
--------simplest form
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18/42 = 3/7
18/42 = 3/7 in its simplest form
3/7
18/24 = 0.750.75 = 3/4
Three over seven is the lowest reduction.