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Anonymous
three over ten
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9/10 - 2/5 = 9/10 * 4/10 = 5/10 = 1/2 or 0.5
1/2 = 5/10 so then 5/10 - 3/10 = 2/10 = 1/5
4/5 - 2/10 = 4/5 - 1/5 = 3/5
4/10 or 2/5
9/10 - 1/2 = 9/10 - 5/10 = 4/10 = 2/5