4/5 * 10/13 = 40/65 = 8/13.
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(3/7)(10/13)(14/15)=(4/13).
(13/4) + (-5/2) =(13/4) + (-10/4) =(13-10)/4 = 3/4
10/13 × 26/15 = 4/3 or 11/3
13 over 4 as a mixed number = 31/4
6 13/15 + 4 1/15 = 10 + 13/15+1/15 = 10 14/15