Use 10% to find 80% of 80:
First find 10% of 80: 80 x 0.10 = 8
Then find 80% of 80 using the result from the previous step: 8 x 10 = 80
Therefore, 80% of 80 is 64.
Then find 80% of 80 using the result from the previous step: 8 x 10 = 80
Therefore, 80% of 80 is 64.