The LCM of 10 and 13 is 130
9/10 (13) + 6/13 (10)
117/130 + 60/130 = 177/130 = 1 and 47/130
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6 13/15 + 4 1/15 = 10 + 13/15+1/15 = 10 14/15
3/5 + 7/10 = 6/10 + 7/10 = 13/10 = 1 and 3/10
10 over 3 plus 15 over 6 = 65 5/6
13 + 3 - 6 + 10 = 20 : answer if it is 3 minus 6 in the question. 13 + 3.6 + 10 = 26.6 : answer if it is a decimal 3.6.
10 + 9 = 19 19 - 6 = 13