Maths Crossword Challenge

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Across
  1. 2. Also means Plus
  2. 5. How we remember the Order of Operations
  3. 6. Something we plot (x, y) co-ordinates on
  4. 11. A letter used in place of a number in maths
  5. 12. A whole number
  6. 13. Also means Minus
Down
  1. 1. Also means Subtract
  2. 3. Also means How Many
  3. 4. Also means Multiply
  4. 7. A rule used to solve problems
  5. 8. A maths problem that uses letters and numbers
  6. 9. Also means Times
  7. 10. Also means Add