We will create a ten box frame for each number
8 | · | · | · | · | · | · | · | · |
---|
+ 3 | · | · | · |
---|
8 + 3 = 11
Use addition:
8 + 3:
Line up our numbers vertically:
8 | |
+ | 3 |
8 | |
+ | 3 | 1 |
Column 1: 8 + 3 = 11
Since 11 > 9, we take the right digit = 1.
Carry the 1 for Column 2
1 | |
8 | |
+ | 3 |
1 | 1 |