Maths club crosswords!

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Across
  1. 4. A whole number greater than 1 with exactly two positive factors
  2. 7. A shape whose points are all the same distance from its centre
  3. 9. The U-shaped graph of a quadratic function
  4. 10. The integer that is neither positive nor negative
  5. 13. A letter or symbol whose value can change
  6. 14. The amount of turn between two rays with a common endpoint
  7. 16. The branch of mathematics that uses letters and symbols to represent numbers
Down
  1. 1. A quadrilateral with four equal sides and four right angles
  2. 2. A quantity that has both magnitude and direction
  3. 3. A number written as one integer divided by another
  4. 5. A whole number that can be positive or negative
  5. 6. A number expressed using a point
  6. 8. The distance from the centre of a circle to its circumference
  7. 11. A number that divides another number exactly
  8. 12. The middle value when a set of data is arranged in order
  9. 15. A number multiplied by itself three times