The denary, or base 10, equivalent of 22 expressed as a number is 4.
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2^16-1= 65536
A denary number is a number based on the ten digits, from 0 to 9. This is in contrast to the binary system used in computing, which consists entirely of 0s and 1s.
If a number is to the power of 2 it is "squared". The number that is squared is the "root".
2
The number times itself. For example 2 squared = 2x2=4 so 2 squared =4