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MrEquation
Hello, 

One way to do this is to convert the fraction 2/3 into 20/30 by multiplying it by ten.

Then, it is clear to see that 21/30 is more than only 20/30.

Good question,
MrEQ
It’s not greater it’s less for example 21/30 needs 9 more to equal 1 whole and 2/3 needs 1 to make one whole making it greater than 21/30