Math Review Crossword Puzzle

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Across
  1. 4. A quadrilateral with two pairs of parallel lines
  2. 6. A parallelogram with all sides equal to each other
  3. 7. A shape that has 3 sides
  4. 9. Numbers lower than zero
  5. 11. The size of a shape's surface
  6. 12. A unit of mass
  7. 13. What is the name for numbers like 1/2, 3/4, 7/10?
  8. 16. A unit of volume
  9. 17. A shape that has 7 sides
  10. 18. A rhombus with right angles
Down
  1. 1. A shape that has 6 sides
  2. 2. A shape that has 4 sides
  3. 3. The sum of all the sides of a shape
  4. 5. A shape that has 8 sides
  5. 8. A shape that has 5 sides
  6. 10. What is the name for numbers like 0.5, 26.13, 1.004?
  7. 14. Half a circle
  8. 15. A unit of length