Smart math

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Across
  1. 1. Joins numbers together
  2. 4. a line segment through a vertex and perpendicular to a line containing the base.
  3. 7. an answer obtained by multiplying two quantities together
  4. 8. the area of variation between upper and lower limits on a particular scale
  5. 12. path that surrounds a two dimensional shape
  6. 13. the number on top for a fraction
  7. 15. Combining numbers together
  8. 16. the number on the bottom for a fraction
  9. 18. can be divided evenly by itself and 1, is larger than 1
Down
  1. 2. splitting numbers apart from the other
  2. 3. a result obtained by dividing one quantity by another
  3. 4. the measurement of a surface
  4. 5. A number over a number,can be simplified sometimes
  5. 6. Takes away numbers
  6. 9. amount of space that an object occupies
  7. 10. portable electronic device used to perform mathematics
  8. 11. one part in every hundred
  9. 12. 3.14
  10. 14. the result of adding two numbers together
  11. 17. the point where the y and x axis intersect at 0,0