1. The common factor of x²y² and x³y³ is

2. The common factor of x³y² and x⁴y is

3. The common factor of a² m⁴ and a⁴m² is

4. The common factor of p³q⁴ and p⁴q³ is

5. The common factor 12y and 30 is

6. The common factor of 2x, 3x³, 4 is

7. The common factor of 10ab, 30bc, 50ca is

8. The common factor of 14a²b and 35a⁴b² is

9. The common factor of 8a²b⁴c², 12a⁴bc⁴ and 20a³b⁴ is

10. The common factor of 6a³b⁴c², 21a²b and 15a³ is