Addition and Subtraction

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Across
  1. 1. 23-21=
  2. 3. 2+5=
  3. 5. 32-16=
  4. 8. 23-18=
  5. 10. 3+1=
  6. 11. 9+5=
  7. 14. 9+4=
  8. 15. 8+3=
Down
  1. 2. 17-16=
  2. 4. 11-2=
  3. 6. 6+6=
  4. 7. 5+1=
  5. 9. 16-8=
  6. 10. 21-6=
  7. 12. 20-10=
  8. 13. 18-15=