Read the numbers carefully.
Start adding from the ones column.
Always add from the right side first.
Addition without regrouping
Add the digits in each column.
If the total is 9 or less, write the answer under the line.
Move to the next column (tens, then hundreds).
Addition with regrouping
If the total in a column is 10 or more, regroup.
Write the ones digit under the line.
Carry the extra ten to the next column.
Add the carried number to the next column.