10) Cross simplify:
2/2 = 1
4/2 = 2
1/3 x 7/2 = 7/6, or 1 1/6
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11) They have the same denominators, so just add across
7 + 8 = 15
15/11 = 11/11 + 4/11
11/11 = 1
1 4/11 is your answer
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12) 38220/15 = 2548
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hope this helps
