All about math

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Across
  1. 3. What is 7/12 - 5/12?
  2. 5. What is the opposite of addition?
  3. 7. What is 0.007 in fraction form?
  4. 9. What is 234 x 4?
  5. 13. What does "quotient" mean?
  6. 16. What does "product" mean?
  7. 17. What does "sum" mean?
Down
  1. 1. What is the opposite of multiplication?
  2. 2. common multiple What does LCM stand for?
  3. 4. What is 2500 divided by 25?
  4. 6. What is the sum of 2/4 and 5/4?
  5. 8. What is the 2/5 + 2/3?
  6. 10. What is the sum 2/10 and 3/10?
  7. 11. thousandths What comes after the thousandths place?
  8. 12. What is the missing number in 5 + _ = 12
  9. 14. What does "difference mean?
  10. 15. What comes before the tens place?