To find what percentage one number is of another, you can use the formula:
percentage = (number being compared / reference number) * 100
So in this case, the percentage that 80 is of 64 can be found by plugging those numbers into the formula:
percentage = (80 / 64) * 100
= 1.25 * 100
= 125
Therefore, 80 is 125% of 64.