20/10 = 2/1 => 2
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20/10 × 20/1 = 40/1
well, half of 40 is 20. 20 divided by 2 = 10 and 40 divided by 2 = 20 so now you have 10 over 20. then: 10 dived by 2 = 5 and 20 dived by 2 = 10 so now you have 5 over 10, and 5 is half of 10 so it is 1 over 2.
7/20 + 9/10 = 7/20 + 18/20 = 25/20 = 5/4
10/20 reduces to 1/2.
7 over 10