Vocabulary and small math problems

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Across
  1. 1. √25 divided by 5
  2. 4. opposite of negative
  3. 8. Valor in English
  4. 9. Square root of sixteen
  5. 12. 10 times 3
  6. 13. Square root of √121
  7. 14. One hundred divided by five
  8. 15. Inverso in English
Down
  1. 2. Error in English
  2. 3. Differencia in English
  3. 5. 10 times 4
  4. 6. Opposite of up
  5. 7. Comprar in English
  6. 10. Fifteen divided by three
  7. 11. Opposite of positive
  8. 14. √36 divided by √9