Multiplication in general is important; not just 2-digit numbers.
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The smallest four digit number is 1000. It is even so 1001 is the smallest four digit number that is odd.
The smallest four-digit number not using zero is 1000. In a four-digit number, the first digit cannot be zero, so the smallest possible value for the first digit is 1. The remaining three digits can be any number from 0-9, so the smallest possible four-digit number is 1000.
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