The second smallest prime number is 3, so the ones digit is 3.
The tens digit is twice as large as the hundreds digit. This means our hundreds digit cannot be greater than or equal to 5 since those numbers doubled are two-digit numbers. That means our possible numbers are 123, 243, 363, and 483.
Of these choices, 243 is the only number divisible by 9 since 2 + 4 + 3 = 9 and 9 is divisible by 9.
Mathnasium of Rocklin is a math-only learning center for K-12 students in Rocklin, CA. Trusted by over a million parents, Mathnasium uses personalized learning plans and the proprietary Mathnasium Method™ to help students catch up, keep up, and get ahead on their math journey.
Our specially trained tutors deliver face-to-face instruction in a supportive and fun small-group environment, working with students to develop a deep understanding of math, build confidence, and improve academic performance.
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