Answer:
2
Step-by-step explanation:
18 = 2 × 3 × 3
22 = 2 × 11
choose the number that appears most
which is 2
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
