Advanced Starters:Showing only Number Advanced StartersBack To The Factory: Find all the numbers below 1000 which have exactly 20 factors [Topic(s): Factors, Possibilities, Prime, Number] Multiple of sum of digits: What number is six times the sum of its digits? [Topic(s): Number] Nine Digit Numbers: How many different nine digit numbers are their that contain each of the digits from one to nine? [Topic(s): Number] Unlucky Seven Eleven: Follow the instructions to multiply a chosen number then explain the result you get. [Topic(s): Number, Place Value]

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