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I started by using my times table knowledge and if it didn't fit into the other ones in the same row I would swap them around. I kept doing that until I filled in everything. I saw that the number 49 was there and I knew that the only factors, which were 2-12, were 7 and 7. So the number that is used twice is 7. I filled in the numbers that I needed to multiply by and I soon finished the problem