Mathematics Crossword

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Across
  1. 1. the smallest whole number is
  2. 3. 1,2,4,5,10,20 are the factors of
  3. 5. what is the inverse of division
  4. 7. 52-[3+{4+4(6+4)}] solve the bracket
  5. 8. the successor of 599 is
Down
  1. 2. which natural number has no predecessor
  2. 4. 1,2,3,4,6,12 are factors of
  3. 6. the multiplicative identity for whole numbers is
  4. 9. the successor of two digit number