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You add as many zeros to the number as you have in the power of 10.
googol is the number 1 follwed by 100 ie 10 power of 100
index is the same as power The index of a number say how many times you have to use the number in a multiplictaion. e.g; 2 10 = 10*10=100
10 is so important because we use a base-10 counting system.
If you don't have a calulator with the percent key, then use a decimal number. Example being 4% would then be .04, or 10% would be .10.