Understanding Addition

How do you add whole numbers?

First, remember this:

  • When adding whole numbers, always work from right to left. Add the digits in the ones column first, and then add the digits in the tens column.

Example 1 : First add the digits in the ones column. Use the blocks beside the problem to help you understand.

    
Now add the digits in the tens column
(2 tens + 0 tens = 2 tens).

  

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