31. The sum of a natural number with a whole number is always
32. The sum of two whole numbers is always
33. Which is the smallest whole number
34. Which natural number has no predecessor
35. Which number is identity for Addition of whole number
36. Which number is identity for multiplication of whole numbers
37. Which of the following will not represent 0
38. Whole numbers are closed under which operation
39. Write the correct number to complete; 13x100x..........= 1300000
40. Write the successor of 1997
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