Answer:
1) 5/10 * 5 = 2.5 (same thing as 1/2*5 or 5/2)
2) 3/5*10 = 6 (we can simplify it to 3*2 = 6)
3) 5/6*3 = 5/2
4) 5/6*12 = 10
5) 3/5*20 = 12
6) 2/3*8 = 16/3
7) 2/9*3 = 2/3
8) 4/7*21 = 12
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