Nathan's Math Crozzword-Medium

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Across
  1. 2. 84/12
  2. 6. 2000+1000-900-1-93+1
  3. 7. 11+11+11-10-1-2
Down
  1. 1. (bonus Nathan's favorite bird) hint belted crown fisher
  2. 3. 1000-100-90-100-100-100-200-200-100-10
  3. 4. 100-13+8-1+1
  4. 5. 90-80+22-11-9+2-4