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Puzzle of the Day

These puzzles are also printed in Eight days a week, a booklet published by the Association of Teachers of Mathematics.

Split the number 17 into whole numbers (for instance 2 and 15 or 3, 4, and 10). Multiply these numbers together. What is the highest number that can be made ?

Answer: 4x6x7=168 if they must be different, or 3x3x3x3x3x2=486