Practise Column Addition and Subtraction
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Practise accurate, structured column addition and column subtraction using this free, interactive math practice tool. It helps students master place value, borrowing, carrying digits, decimal alignment and the vertical written methods taught in elementary and middle school math classes in the USA, Canada, Australia and New Zealand.
Choose whether you want to practise addition or subtraction, select how many digits appear before the decimal point, and decide whether to include decimal places. A new calculation appears instantly, clearly arranged into vertical columns so students can see how each place value lines up.
Type one digit per box, starting from the rightmost column. Press Tab to move between boxes from right to left, just like working through written column methods on paper. When you are ready, use the Check button to mark your answer, or the Show Answer button to reveal a full model solution, including carrying and borrowing steps.
In column addition, numbers are lined up so that the ones, tens, hundreds, thousands and decimal places are in straight vertical columns. You add from right to left. When the total in a column is 10 or more, you carry the extra ten into the next column on the left. This process is often called carrying, regrouping or renaming.
The game reinforces this process: if a student types two digits in one answer box, the first digit automatically moves into the carry box and the second digit stays in the answer box. This matches the formal written method students are taught in school.
For column subtraction, line up the numbers in place-value columns and subtract from right to left. If the top digit in a column is smaller than the digit below it, you need to borrow from the next column to the left. Borrowing (also called decomposition, regrouping or renaming) means reducing the left digit by one and increasing the current digit by ten.
The game shows this visually. When you borrow from a digit, it turns red and a small red 1 appears next to the digit that has received the borrowed ten. This clear visual model helps students understand what is happening when they borrow, rather than just memorising steps.
Mastering the column method develops both conceptual understanding and procedural fluency. It is important for:
This game combines interactive modelling, instant feedback and curriculum friendly practice so students in the USA, Canada, Australia and New Zealand can master written addition and subtraction with confidence.