Math Crossword

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Across
  1. 3. a shape with three sides
  2. 6. a whole number which has exactly two factors, one and itself
  3. 10. a whole number with more than two factors
  4. 11. the space inside of a 2D shape
  5. 12. a shape with four equal sides and angles
  6. 13. a quarter of 80
Down
  1. 1. the result of subtracting numbers
  2. 2. this many cents in a dime
  3. 4. the sum of the sides of a 2D shape
  4. 5. the result of dividing numbers
  5. 7. the result of adding numbers
  6. 8. the result of multiplying numbers
  7. 9. the space inside of a 3D shape
  8. 12. the number of faces on a cube