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phép trừ (qua 10) trong phạm vi 20

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  • 11-2 11-6. 11-3. 11-7. 11-4. 11-8 11-5 11-9
    9. 4. 7. 3. 6 2. 5 2
  • 11-2 11-6. 11-3. 11-7. 11-4. 11-8 11-5 11-9
    9. 4. 7. 3. 6 2. 5 2
  • 11-2 11-6. 11-3. 11-7. 11-4. 11-8 11-5 11-9
    9. 4. 7. 3. 6 2. 5 2
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