Mathematics Crossword

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Across
  1. 2. 52-[3+{4+4(6+4)}]
  2. 5. 1,2,3,4,6,12 are factors of
  3. 7. what is the inverse of division
  4. 8. when two whole number are added, the result is always a _______________ number
  5. 9. what is the multiplicative identity for whole number
Down
  1. 1. estimate using general rule, 796-314
  2. 3. 1,2,4,5,10,20 are factors of
  3. 4. which is the smallest whole number?
  4. 6. what is the successor of 599
  5. 9. which natural number does not have any predecessor?