For the purposes of school work, the answer they are probably looking for is 100.
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the answer is 000,1,000 000
zero is the smallest even number (0)
1 000 000 (1 million)
Predecessor of a number is obtained by subtracting 1 from it. The smallest 4 digit number is 1000 and its predecessor is 1000 - 1 = 999.
The smallest three digit composite number is 100, and the largest two digit number is 99. 100-99=1.