Maths Week Crossword Puzzle

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Across
  1. 2. a topic in maths has letters used to represent numbers
  2. 3. 0.5x6=?
  3. 6. what is 9+6
  4. 8. x=-9 y=9 x+y=?
  5. 9. √144 = ?
  6. 10. 15x6=?
Down
  1. 1. a subject that includes the topic of numbers
  2. 4. a mathematical statement that shows that two mathematical expressions are equal
  3. 5. √25=w w=?
  4. 7. what is 8 divide by 4