Schoolthings and numbers

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Across
  1. 1. 40
  2. 5. 5
  3. 6. Patrone
  4. 8. Filzstift
  5. 13. it is big and made of glass
  6. 14. you put your things on it and work there
  7. 16. Anspitzer
  8. 17. the teacher writes on it
  9. 18. the teacher's "pen"
  10. 19. 18
  11. 20. Radiergummi
  12. 21. you can sit on it
  13. 22. 50
Down
  1. 1. 14
  2. 2. Lineal
  3. 3. where you put your pens in
  4. 4. you put rubbish in it
  5. 6. Buntstift
  6. 7. Schulbuch
  7. 9. 13
  8. 10. Tintenkiller
  9. 11. it is green and you must water it
  10. 12. you put your books on them
  11. 15. a big paper picture