Math crossword

123456789101112131415161718
Across
  1. 3. involves everything in here
  2. 4. digit 10/20/40/34
  3. 8. numbers on top of each other
  4. 9. +
  5. 12. x
  6. 14. song we did
  7. 17. digits
  8. 18. ice-cream
Down
  1. 1. advanced math
  2. 2. ÷
  3. 3. The teacher
  4. 5. time
  5. 6. used to calculate faster
  6. 7. problem problem solving problems
  7. 10. egyptian pyramids
  8. 11. a box
  9. 13. line endless straight line
  10. 15. the answer
  11. 16. dots in your math
  12. 18. line has no corners but never stops