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Across
  1. 3. a shape with four sides
  2. 8. a rectangle used to multiply
  3. 10. the space on the inside of a shape - usually counted in units
  4. 12. two numbers being compared(?)
  5. 13. a shape with a base and 2 sides pointing up at an angle
Down
  1. 1. lines coming from a 90 degree angle
  2. 2. a quadrilateral with at least one pair of parallel sides.
  3. 4. a number with a fraction to accompany it - often used in multiplication sentences
  4. 5. how tall someone or something is
  5. 6. the result of any multiplication, division addition etc. problem
  6. 7. the platform an object usually sits on, both 2d or 3d
  7. 9. lines that are equally across from eachother, both going straight
  8. 11. the measurement of the sides of a shape