Maths Crossword

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Across
  1. 3. reverse process of expanding brackets
  2. 8. equation of a straight line
  3. 9. Sherlock Holmes
  4. 10. 1,2,3...
Down
  1. 1. ratio between two related quantitties in different units
  2. 2. x,y
  3. 4. Number or ratio of 100
  4. 5. slope
  5. 6. Letters and numbers
  6. 7. 1:4