2/3 = 4/6 and 1/2 = 3/6 so 2/3 is greater than 1/2 (because 4/6 > 3/6)
2/15 = 4/30 and 1/2 = 15/30 so 2/15 is less than 1/2 (because 4/30 < 15/30)
Conclusion: 2/3 is greater than 2/15
Hope it helps.
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