Nathan's Crossword puzzle

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123456789101112131415161718
Across
  1. 3. A factor of 2 or more numbers
  2. 7. numbers
  3. 8. LXW
  4. 12. A part of every hundred
  5. 15. multiply by 2 accounts for both sides
  6. 16. changing the order or position of
  7. 17. then add all
  8. 18. Multiply first term by each
Down
  1. 1. The multiplicative inverse of a number
  2. 2. The ratio of two different numbers
  3. 4. Large numbers in terms of power
  4. 5. LXWXH
  5. 6. numerator is greater than or equal to denominator
  6. 9. Lowest common multiple shared by 2 or more numbers
  7. 10. A fraction that is below
  8. 11. LXW/2
  9. 13. a fraction that is above
  10. 14. A number that is divisible by itself and 1