Math World Crossword Puzzle

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Across
  1. 2. Opposite of subtraction
  2. 4. Length x width x height = _________
  3. 6. 2x+3y=14; what are the letters called in that equation?
  4. 8. To reduce down to simplest form
  5. 10. 1/5; what is the top number called in a fraction?
  6. 13. 0.004
  7. 14. 3+2=5; this is an example of an _______.
  8. 16. 7/9; What is the bottom number called in a fraction?
  9. 18. 2x5=10
Down
  1. 1. 1/4; This is a ______.
  2. 3. 4-3=1; What is this operation called?
  3. 5. Mathematics dealing mainly with shapes
  4. 7. Mathematics dealing mainly with equations with variables
  5. 9. side+side+side+side = __________
  6. 11. Δ; this shape is a ________.
  7. 12. 2^6; what is the second number called?
  8. 13. opposite of multiplication
  9. 15. visual representation of a function
  10. 17. opposite of positive