Question 536185
You can always add the two numbers and then divide by 2.  That will give you the midpoint between the numbers.
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1/5 + 2/3 = (3+10)/15 = 13/15
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13/15 * 1/2 = 13/30
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Note that dividing by 2 is the same as multiplying by 1/2.
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1/5 = .20
2/3 = .67
13/30 = .43
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Done.