Mathematic Puzzle

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Across
  1. 5. is add
  2. 8. is is divide
  3. 10. is mulitiply
  4. 11. is big
Down
  1. 1. is a thing
  2. 2. is answer
  3. 3. is maths
  4. 4. is small
  5. 6. is sub
  6. 7. value is a value
  7. 9. is that we know