Discussion
Which of the following is the largest 3 digit composite number?
Answer: A
A composite number has factors other than 1 and itself. The largest three digit number is 999, and it is divisible by 3 (the sum of its digits is 27) and by 9 and 27, since \(999 = 27 \times 37\), so it is composite. As 999 is composite and is the largest three digit number, it is the largest three digit composite number. The options 998, 989 and 979 are smaller, even though they are composite as well (998 is even, 989 = 23 x 43, 979 = 11 x 89). The answer is 999, option A.
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