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It means that you write a number as a power of ten. So it will be "something" multiplied by 10^"something else" The "something" has to be between 1 (inclusive) and 10 (not inclusive). The "something else" can be any number.
Any number between 100 & 999 inclusive !
An even number really has no meaning
A three digit number is any counting number between 100 and 999 (inclusive). It is made up of three digits, the first of which cannot be 0.
90 to 96 inclusive.