Math Crossword Puzzle

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Across
  1. 2. Add or subtract the same amount from both sides
  2. 6. The number in front of the variable
  3. 7. Parts of an equation or expression
  4. 9. (0,0)
  5. 13. When you multiply or divide the same number from both sides
  6. 16. We can add or multiply two numbers and the order doesn't matter
  7. 17. We can add or multiply three or more numbers and the order doesn't matter
  8. 18. Amount of surface L*W
Down
  1. 1. (x,y)
  2. 3. When the product of two numbers is one
  3. 4. The sum of two numbers is zero
  4. 5. Distance around a figure
  5. 8. Answer to multiplication
  6. 10. One of the 4 regions on the coordinate plane
  7. 11. Never ending decimal, cannot be written as a fraction
  8. 12. Answer to addition
  9. 14. A number by itself(no variable)
  10. 15. Repeating or ending decimal, written as a fraction, whole number