What does it mean?

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