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Oh! Hidden Inside?
Age 11 to 14
Challenge Level 
Find the number which has 8 factors, such that the product of all the factors is 331776.
Remember: A a factor (or divisor) is a number that divides exactly into another number.
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Adding All Nine
Make a set of numbers that use all the digits from 1 to 9, once and once only. Add them up. The result is divisible by 9. Add each of the digits in the new number. What is their sum? Now try some other possibilities for yourself!
