Subtraction Calculator — a − b with Number-Line Visualization
Enter any two numbers — integers or decimals, positive or negative — to compute the exact difference and visualize where the minuend, subtrahend, and result fall on a number line.
The result of subtracting b from a
- 1
Minuend (starting value)
25 - 2
Subtract subtrahend (b)
25 − 13 = 12
How does this calculator work?
Difference = a − b. The minuend is the number you subtract from; the subtrahend is the amount removed. The result is positive when a > b, zero when a = b, and negative when a < b. The absolute difference |a − b| gives the magnitude regardless of sign.
Formula
How this is calculated
Subtraction is one of the four basic arithmetic operations. Given a minuend a and a subtrahend b, the difference is a − b — the distance from b to a on the number line, with a positive sign if a > b and a negative sign if a < b.
The terms minuend (the starting amount) and subtrahend (the amount removed) come from Latin and are used in formal mathematics, though in everyday language people simply say "the first number minus the second number." The absolute difference |a − b| is always non-negative and gives the magnitude of the gap between the two values regardless of which is larger.
This calculator handles integers and decimals — both positive and negative — with up to 10 decimal places of precision. For very large integers beyond JavaScript's safe-integer range (±2⁵³−1) small rounding errors can occur; for exact big-integer arithmetic use a dedicated big-number library.
Frequently asked questions
The minuend is the number you start with (the one being diminished), and the subtrahend is the amount you take away. In 10 − 4 = 6, the minuend is 10, the subtrahend is 4, and the difference is 6.
The result is negative. For example, 3 − 7 = −4. Subtraction is not commutative: a − b ≠ b − a (unless a = b). On the number line you move left by the subtrahend, which can take you below zero.
Yes — enter decimals for fractions (e.g. 0.75 for ¾) and use a minus sign for negative numbers. For exact fraction subtraction (like 3/4 − 1/3) use the Subtracting Fractions Calculator to get a simplified rational result.
Also known as
TG we-Calculate Editorial Team. (2026). Subtraction Calculator — a − b with Number-Line Visualization [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/subtraction-calculator
TG we-Calculate Editorial Team. "Subtraction Calculator — a − b with Number-Line Visualization." TG we-Calculate. 2026. https://we-calculate.com/calculator/subtraction-calculator.
TG we-Calculate Editorial Team, "Subtraction Calculator — a − b with Number-Line Visualization," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/subtraction-calculator
@misc{wecalculate_subtraction_calculator, title = {Subtraction Calculator — a − b with Number-Line Visualization}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/subtraction-calculator}}, year = {2026}, note = {TG we-Calculate} }
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