natural numbers and whole number

123456
Across
  1. 3. Place value of 4 in 84897
  2. 4. Product of 67 and 345
  3. 5. Predecessor of 45,897
  4. 6. Successor of 87680
Down
  1. 1. Sum of 12562 and 1257
  2. 2. Numeral for thirty-five thousand four hundred seven
  3. 3. Difference between 7865 and 12463