Do we have to divide 1/2 with 4 then 1/2 with 18 and so on?

a/b/c/d = a/b * d/c and 4 = 4/1 in fractional form

so 1/2/4/1 = 1/2 * 1/4 = 1/8

or use 1/2 = 0,5 and 0,5/4 = 0,125 = 1/8

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denominator 4 means 1/4 when 1/2 / 1/4 =1/2 x 4/1= 4/2= 2.