Numbers to 20

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Across
  1. 6. One less than four
  2. 7. 10+10
  3. 9. One more than sixteen
  4. 10. 7+7
  5. 13. A one and a nine
  6. 15. 3+4
  7. 16. 4+4
Down
  1. 1. A one and a three
  2. 2. 2 ones
  3. 3. One more than two
  4. 4. 8+8
  5. 5. A one and a five
  6. 8. 1+1
  7. 10. 2+2
  8. 11. 6+6
  9. 12. 9+9
  10. 13. One less than 10
  11. 14. 1
  12. 15. One less than five
  13. 17. 5+5