1 ก. 8 1. 2 × 4 1 2 2. 3 × 12 ข. 9 3. × 7 ค. 12 1 7 1 4. 3 × 6 ง. 24 2 2 1 5. × 20 จ. 4 5 6. 12 × ฉ. 12 3 4 7. 9 × 2 ช. 9 81 3 4 8. × 27 ซ. 9 4 2 9. × 30 ฌ. 1 5 1 1 10. 12 × ญ. 24 2