Add three 2-digit numbers

Each column may sum to 20 or more, requiring students to carry a value of 1 or even 2 into the next column — a step that demands careful tracking.

Add the first two values in the column, note the intermediate sum, then add the third number to it — writing carries clearly reduces errors.

Most worksheet problems are presented vertically to reinforce columnar alignment, though horizontal versions can also appear as a reading and transcription challenge.