math holiday homework

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Across
  1. 2. ____ is distributive over addition for whole numbers
  2. 7. The numbers 0,1,2,3 form the collection of
  3. 10. But whole numbers are not___________
  4. 11. division by _____ is not defined
Down
  1. 1. Identify this property 8(9+4)
  2. 3. all the natural numbers are__________
  3. 4. Identify this property (5+4)+9 = 5+(4+9)
  4. 5. the numbers 1,2,3 form the collection of
  5. 6. Identify this property 2+4=4+2
  6. 8. 20-(10-3+2)
  7. 9. _____ is identity for addition of whole numbers