What does it mean?

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Across
  1. 3. The big number attached to an exponent
  2. 5. a symbol standing in for a number
  3. 7. Number, All Numbers
  4. 9. Negative numbers, Zero, and positive numbers
  5. 11. a combination of symbols and numbers
  6. 14. Numbers, Numbers you can count on your fingers
  7. 15. math operation in which your adding a number to itself a certain number of times
  8. 16. Numbers that have no end
Down
  1. 1. math operation of breaking up a big number into smaller equal parts
  2. 2. Number, Zero, and positive numbers
  3. 4. root, a when multiplied by itself give the original number
  4. 6. math operation in which 2 or numbers are combine to make a greater number
  5. 8. math term meaning opposite
  6. 10. The small number above the base
  7. 12. math operation in which 2 or more numbers are taken away to make a smaller number
  8. 13. Numbers that have an end