To write repeated multiplication in an exponential notation, you should write the number that has to be multiplied as the base. Count the number of times that the number is used.
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The exponent indicates the number of times the base is used as a factor.
An exponent of 1 can be ignored. In the same way that multiplication by 1 can be ignored.
Multiplication
1105 221,5 17,13,5
20000 using the exponent of 4 = 11.89214fourth root of 20000 = 11.8921