ADDITION AND SUBSTRACTION

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Across
  1. 2. 20+20
  2. 3. 7+10
  3. 5. 10+15
  4. 7. 9+9
  5. 8. hundred 50+30+20
Down
  1. 1. 21-7
  2. 4. 20+50
  3. 5. 45-15
  4. 6. 20-9
  5. 7. 96-16