20 is a common factor of 80 and 100.
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80 and 100
90.
97 is the largest prime number below 100.
When calculating with percentages, one method is to first convert them to decimals or fractions. Using the decimal method, 80%=0.8 and 100%=1. Therefore, the literal translation of you question would read "0.8 x 1 = 0.8". 0.8 is the decimal answer. If you wanted a percentage answer, you would convert this back to 80%. Kind of a nonsense question, though. You usually do not take percentages of percentages.
1 is the only number that is a divisor of 73 and 100.