Subtract aligned whole numbers or decimals with a vertical layout, regrouping table, running remainder visual, target check, and answer verification.
The **Long Subtraction Calculator** focuses on the regrouping method used in vertical subtraction. Instead of only returning a difference, it aligns the minuend and subtrahends, tracks the amount removed, and shows when a column must borrow from the place value to the left. That makes it useful for classroom practice, homework checking, and any arithmetic task where you want a transparent subtraction process.
You can enter a simple two-row problem such as 500 - 237 or a longer chain such as 3,250 - 875 - 224. The calculator handles decimal alignment too, which helps with money, measurements, and other applied arithmetic. The aligned layout shows the same row structure you would write by hand, while the regrouping table explains each borrow step in the combined subtraction view.
The running remainder visual is particularly useful for real-world problems. If you are modeling a declining balance, remaining inventory, or a score that drops over time, each bar shows how much value remains after each subtraction step. A separate answer-check section lets you enter your own result and see immediately how far it is from the exact difference.
Use the Target Result input when you want to compare your final answer with a workbook solution, a budget threshold, or an expected remainder. Together, the aligned layout, borrow table, running table, and answer check make this page more than a simple minus button.
Long subtraction is useful when the borrow logic matters as much as the final answer. This page keeps the regrouping steps visible so you can see exactly which place value changed and why the difference came out the way it did. It is especially helpful when several zeros or decimal places make the borrowing path hard to track mentally.
Long subtraction aligns digits by place value, subtracts each column from right to left, and borrows 1 from the next higher place value whenever the top digit is smaller than the bottom digit in that column.
Result: 500 - 237 = 263
Start with the ones column. Since 0 is less than 7, borrow from the tens place. The tens place is 0 too, so the borrow continues from the hundreds place. After regrouping, the ones column becomes 10 - 7 = 3, the tens column becomes 9 - 3 = 6, and the hundreds column becomes 4 - 2 = 2. The final difference is 263.
Subtraction problems often model a balance that is being reduced step by step. The running remainder view makes that interpretation visible so you can see how much is left after each removal.
Borrowing is just place-value conversion. One unit from the next column becomes ten units in the current column, which preserves the value while making the subtraction possible.
If you add the difference back to the removed amount, you should recover the original starting value. That reverse check is a quick way to confirm that the subtraction was aligned correctly.
Long subtraction is the vertical column method for finding a difference by aligning place values and subtracting from right to left, borrowing from the next column when necessary. The layout is designed to make regrouping visible instead of hiding it inside mental arithmetic.
Borrowing means taking 1 unit from the next higher place value and converting it into 10 units of the current place value. For example, 1 ten becomes 10 ones.
Yes. The calculator aligns decimal places so values such as 42.75, 9.80, and 1.25 line up correctly before subtraction.
The regrouping table is designed for the standard positive long-subtraction case where the combined amount removed is non-negative and does not exceed the aligned minuend. If the result goes negative, the main subtraction still works, but that specific borrow view is suppressed.
Inverse check means adding the difference back to the total removed. If the subtraction is correct, that sum rebuilds the original minuend.
A target is helpful when you expect a specific remainder, such as a balance after expenses or a value printed in an answer key. The calculator shows whether your actual result is above or below that target.