First you need to figure out the lowest common denominator for both 8/12 and 4/8. 24 would be that least common denominator so once you change the fractions to 16/24 - 12/24 you would get 4/24 which can then be reduced to 1/6.
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Three and seven eights
187
nine minus four and three elevenths is four and eight elevenths
2
Sixteen.