Lets make the fractions into decimals. To make a fraction into decimal you have to divide the numerator by the denominator. The numerator is the top part of a fraction and the denominator is the bottom part of the fraction.
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Calculations
1/3 1 ÷ 3 = 0.3333....
5/6 5 ÷ 6 = 0.83333...
0.83333... is greater then 0.3333..... Therefore 5/6 is greater then 1/3 1/3 is smaller then 5/6