Best crossword in the world 816

1234567891011
Across
  1. 3. number x number
  2. 5. number + number
  3. 8. top of fraction
  4. 9. answer number 10
  5. 11. divide 1 by that number
Down
  1. 1. answer number 6
  2. 2. number - number
  3. 4. what are these 1426
  4. 6. split a number by another number
  5. 7. bottom of fraction
  6. 10. school subject