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4/10 - 1/5 = 2/5 - 1/5 = 1/5
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2/5 - 3/10 = (2×2)/(5×2) - 3/10 = 4/10 - 3/10 = (4-3)/10 = 1/10.
10-4 = 1/104 = 0.0001
4/5 minus 1/2 = 3/10
3/4
It is: 4/5 minus 3/10 = 1/2