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If the number is a multiple of 2, you can put a 9 as the first number then arrange the two numbers so that they create the largest possible even number. If the number is a multiple of 3, you find the total of the two numbers the computer has given, then add the largest single digit number possible that makes sure that all the digits add up to a multiple of three. After this, you can just rearrange the numbers to form the largest number possible. If the number is a multiple of 4, you have the find the largest double digit number that uses at least one of the two numbers given which is a multiple of 4. Place these 2 numbers in the last two boxes then fill the first box in with the other number given by the computer. If a number is a multiple of six, then the number must be divisible by 2 and the sum of its digits must be divisible by 3, because the prime factors of 6 are 2 and 3.