Numbers 1-15 Crossword

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