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The factors of 100 are included in the factors of 200, but I did not use one to find the other.
You could use a Venn diagram.
You could use two threes and two ones, but it's more likely you were looking for -9. That would be 9 and -1.
I would use a factor tree. 1225 245,5 49,5,5 7,7,5,5 5 x 5 x 7 x 7 = 1225
1 and 67