1. The place value of a number starts from right to left in the following order: ones, tens, hundreds, thousands, ten thousands, hundred thousands, etc.

2. Addition is possible with two or more numbers.

4. The result we get after adding the addends is called a sum.

5. The result (Sum) will be same even if two or more numbers are added in any order.

6. Adding 0 (zero) with a number will give the same number as the result.

7. Adding 1 (one) with a number will give the next number or successor of the number as the result.

Example: Add the following numbers: 42784 and 4598

1. Write the numbers in proper columns.

2. Add all the numbers from the ones column (42784 + 4598.)

4 + 8 = 12 (1 tens , 2 ones).

Put the 2 in ones column and carry over 1 to the tens column.

3. Add all the numbers from the tens column (42784 + 4598) and the carried over 1.

8 + 9 + 1 = 18 (1 hundred , 8 tens).

Put the 8 in tens column and carry over 1 to the hundreds column.

4. Add all the numbers from the hundreds column (42784 + 4598) and the carried over 1.

7 + 5 + 1 = 13 (1 thousand , 3 hundreds).

Put the 3 in hundreds column and carry over 1 to the thousands column.

5. Add all the numbers from the thousands column (42784 + 4598) and the carried over 1.

2 + 4 + 1 = 7 ( 7 thousands)

Put the 7 in thousands column. Their is no carry over.

6. There is no ten thousands column for the second number (42784 + 4598).

So put the 4 in the ten thousands column of the result.