There's a bunch of different ways, here's some:
2/3
4/6
8/12
0.666...
2:3
2 * 1/3
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2/3 4/6
4 --- 6
There are two thirds in two thirds, as two thirds suggests. Or the answer could be three if you look at it a different way. One third (1/3) of two thirds (2/3) is two ninths (2/9).
Convert to a common denominator; convert to decimal; compare denominators (larger denominator = smaller fraction, if the numerator is the same).
2/3 .666 and 66%