The factors of 80 are:
1, 2, 4, 5, 8, 10, 16, 20, 40, 80
The factors of 200 are:
1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200
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The Greatest Common Factor (GCF) is: 40
2 x 2 x 2 x 5 = 40
200 = 100*2 so every factor of 100 will be a factor of 200. Also, two times any factor of 100 will be a factor of 200.
Since 80 is a factor of 400, it is automatically the GCF.
Since 18 is a factor of 80, it is automatically the GCF.