Middle School Madness

Weekly problems for middle school students ready for a challenge. These puzzles enhance logical thinking and make math exciting and rewarding.

Four-Digit Primes

Posted: April 21, 2025

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The digits 1, 2, 3, and 4 can be arranged to make 24 different four-digit numbers.  The least created number using these digits is 1234 and the greatest is 4321. Some of these 24 created four-digit numbers using the digits 1, 2, 3, and 4 are prime numbers.  Find the sum of these prime numbers.  

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