Simple Addition and Subtraction

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Across
  1. 3. 37-37=
  2. 5. 98-3=
  3. 7. 56-24=
  4. 9. 40-17=
  5. 10. 21-11=
  6. 12. 16+56=
  7. 13. 14-3=
  8. 14. 100-20=
  9. 16. 50+50=
Down
  1. 1. 73-3=
  2. 2. 75-30=
  3. 4. 30+30=
  4. 6. 49+49=
  5. 8. 20+5=
  6. 11. 87-47=
  7. 15. 48-47=