Written Addition: Column Method

Learning Objective

4Nc18: Add two three-digit numbers using written column addition

Steps for Column Addition

1. Write numbers in columns, lining up place values
2. Add from right to left (ones, tens, hundreds)
3. Carry when the sum is 10 or more

Example: 456 + 378

              456
            + 378
            -----
              834
            

6+8=14 (write 4, carry 1)

5+7+1=13 (write 3, carry 1)

4+3+1=8

Video: Khan Academy (CC BY-NC-SA 4.0) | Aligned to Cambridge Primary 4Nc18