Addizioni e sottrazioni entro il 20

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Across
  1. 2. 10-6 =
  2. 4. 9-4=
  3. 5. 6+6=
  4. 6. 7-4 =
  5. 7. 3+3=
  6. 8. 9+5=
  7. 12. 17+2 =
  8. 13. 12-3=
  9. 16. 20-7=
  10. 17. 1+0 =
  11. 18. 8+8=
Down
  1. 1. 13-8=
  2. 2. 10+5=
  3. 3. 9+9 =
  4. 5. 8-6 =
  5. 9. 20-3=
  6. 10. 18-7=
  7. 11. 10+10 =
  8. 14. 15-7=
  9. 15. 5+5=