Stage: 3 Challenge Level: 
What is the largest possible five-digit number divisible by $12$ that you can make from the digits $1$, $3$, $4$, $5$ and one more digit?
Multiplication & division. Generalising. Place value. Factors and multiples. Modulus arithmetic. Properties of numbers. Integers. Working systematically. Workshop. Divisibility.
Published March 1998,October 2008.
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