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5/8 x 2/7 is 5/28
2/7 x 5/9 x 3/8 x 168 = 10
5/8 x 9 = 5.625
There are 25.4 millimetres in an inch. Therefore, five eighths of an inch is equal to 5/8 x 25.4 = 15.875 millimetres.
23/8 There are 16 eighths in 2 (2 x 8) plus 7 = 23