divide both by 3
18/153 = 6/51
divide both by 3 again
6/51 = 2/17
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19/18 = 11/18
It's 5/18. It doesn't get any simpler than that.5/18 is in its simplest form.
Two thirds (2 over 3).
15/54 '3' is a common factor , so cancel down by '3' Hence 5/18 The simplest form!!!!!
No, 18/15 is not in simplest form. Try 6/5