we can write 6/7-1/3 and this is the same as 18/21-7/21 which is 11/21 if we want to represent this is a decimal it is about .5238 We multiplied the numerator and denominators in both fractions, the first by 3 and the second by 7 to get a common denominator. The we just subtracted.
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2 over 3 is twice is great as 1 over 3.
Such that 64 is equal to 26, or two to the power six, 1/64 is equal to 2-6, or two to the power minus six.
170/1292 - 57/1292 = 113/1292
4
2.9^3 = 24.389