Expressed as a proper fraction in its simplest form, 1/2 + 1/9 = 11/18 or eleven eighteenths. Expressed as a decimal, this is equal to 0.61 recurring (that is, 0.61111...)
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One ninth plus One eighth is 17/72, or seventeen seventy-seconds
11 over 18
1/9 is half of 2/9
three
667