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By looking at the numbers:1,2,3 and 7, we can look and identify the common multiples and fractions. This meant, that the common multiples of 2 were, 2,4,6,8,10,12,14,16,18,20 and so on. We could also have found the factors of 2 which are 1 and 2. A vertical line would mean 2,7,12,17 and 22. 2 is a factor of 2 so yes, 12 is a multiple of 3 so yes, 7 is a multiple of 7 so yes again. And finally, 17 is a multiple of 1