maths crossword

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Across
  1. 2. What comes after 4?
  2. 4. What comes after 12?
  3. 6. What comes after 9?
  4. 7. What comes before 8
  5. 8. What comes after 7?
Down
  1. 1. 4 + 8 =
  2. 2. 2 + 2 =
  3. 3. What comes after 2?
  4. 5. 5 + 4
  5. 7. 3 + 3