Count on Me!

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Across
  1. 3. you use this to erase mistakes
  2. 7. you read this in class
  3. 8. the number with zero one
  4. 9. 4X2?
  5. 11. the person teaches you
  6. 13. the number before five
  7. 15. you use this to write
  8. 17. you sit at this in school
  9. 19. smaller than
Down
  1. 1. The number after zero
  2. 2. people you learn and play with
  3. 4. We use this word when we take away numbers
  4. 5. 2+3?
  5. 6. bigger than
  6. 10. one plus one
  7. 11. the number after two
  8. 12. We use this word when we join numbers
  9. 14. half of twelve
  10. 16. 3X3?
  11. 18. the number after six