Answer:
2
Explanation:
Factors of 18 are 1,2,3,6,9 and 18
Factors of 22are 1,2,11 and 22
The common factor is 2
So, the highest common factor is 2
18 = 2 × 3 × 3
22 = 2 × 11
choose the number that appears most
which is 2
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