Samedi crossword

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Across
  1. 2. the vertical axis
  2. 5. a number less than zero
  3. 8. half of ten
  4. 9. a shape with three angles
Down
  1. 1. a shape with no corners
  2. 3. the number after nine
  3. 4. the result of thirty+thirty
  4. 6. opposite of substraction
  5. 7. the opposite of big
  6. 9. a number between one and three