Math (answers with letters)

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123456789101112
Across
  1. 2. 4+3
  2. 4. 5+3
  3. 6. 5+6
  4. 7. 7-5
  5. 10. 7+11
  6. 12. 5+11
Down
  1. 1. 49+51
  2. 3. 100-100
  3. 5. 5+5
  4. 7. 500+500
  5. 8. 10+4
  6. 9. 7-6
  7. 11. 4+5