Maths Crossword Puzzle

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Across
  1. 4. an arrangement of objects in rows and columns
  2. 5. the number in front of a variable
  3. 6. the use of letters in mathematics
  4. 7. the result of subtracting two numbers
  5. 9. the result of dividing two numbers
Down
  1. 1. the result of multiplying two numbers
  2. 2. an unknown number denoted by a letter
  3. 3. things we do to numbers (+, -, x etc.)
  4. 8. the result of adding two numbers