I think its 104 because if you do 13 x 8 = 104 you will get that answer and also if you know your multiplication facts.
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1 x 104, 2 x 52, 4 x 26, 8 x 13.
5 + 4 x 2 Always do the multiplication/division before addition subtraction. ; mathematical rule. # 5 + 8 = 13
1 x 104 = 104 2 x 52 = 104 4 x 26 = 104 8 x 13 = 104
1 x 8, 2 x 4, 4 x 2, 8 x 1.
15 x 8 = 120 To do more simply using LONG multiplication 15 x 8 80 ( 10 x 8 = 80) 40 ( 5 x 8 = 40) 120 ====