2nd maths

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Across
  1. 4. the piece in the middle of two sets
  2. 7. the average number in statistics
  3. 8. it has the same length and breadth
  4. 9. numbers that are whole but positive or negative
  5. 11. when we put two sets together we call it a ....
Down
  1. 1. what a test is marked out of eg i got 57.....
  2. 2. the formula for a .... is half the base multiplied by the height
  3. 3. the edge of a square or rectangle
  4. 5. numbers that are only positive and whole
  5. 6. what you get when you multiply the length by the breadth
  6. 7. the number in the middle in statistics
  7. 10. a line can have a positive or negative one