The Counting Numbers starting from (1, 2, 3 , 4 , 5 , 6 , .......) and 0 make the whole numbers. Sum of any two whole numbers is always Whole Number which is called as Closure property of addition of whole numbers. Every number which is added is called an addend and the result is called sum.
To add two whole numbers, first write the numbers below each other and align the same units i.e align the units, ones, and hundred under one another. Then start adding the numbers. Start with right end digit of the whole number then add every column. Rule for addition is that when sum of any column is equal to or less than 9 , then write it directly , but when it is greater than 9 , then we have to write the ones digit number and carry the tens digit to the next column.
And it proves the closure property as 34 is also a whole number.