1. What is the highest common factor of 8 and 12?
2. What is the highest common factor of 16 and 24?
3. What is the highest common factor of 28 and 42?
4. What is the highest common factor of 8 and 24?
5. What is the highest common factor of 15 and 18?
6. What is the highest common factor of 20 and 32?
7. What is the highest common factor of 18 and 30?
8. What is the highest common factor of 15, 24 and 30?
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