The easiest way to solve this would be to convert 6 4/5 to a decimal. We know that to convert a fraction to a decimal, we must divide the numerator by the denominator.
4 / 5 = 0.8
0.8 + 6 = 6.8
So, 6 4/5 is 6.8 as a decimal.
See how it's easier now that we've converted the mixed number to a decimal?
There could be many numbers between 6.8 and 7. Some examples are: