Interesting Math

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Across
  1. 2. -
  2. 5. 2x3=6
  3. 7. lines two lines
  4. 8. 10,20
  5. 9. 1,00
  6. 12. 7-2=5
  7. 13. have two point
  8. 15. =
Down
  1. 1. 1,000
  2. 3. number 0,1,2,3,4
  3. 4. ( )
  4. 6. 【 】
  5. 10. place values .
  6. 11. 1+2=3
  7. 14. +