13 and 20 don't have common factors, so 13/20 can't be simplified any more.
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Yes to 13/20
65/100 = 13/20
17 over 20 simplified is 17/20.
20/99 cannot be simplified further.
104/160 Cancel down by '4' 26 / 40 Cancel down by '2' 13/20 Done!!!!