Multiply two whole numbers step by step and review the partial products used in long multiplication.
Last updated: June 2026 | By Patchworkr Team
Long multiplication multiplies a number by each digit of the other number, then adds the shifted partial products together.
123 × 45 = 5535
Does the tool accept decimals?
No. This visualizer is for whole numbers only because the step display is digit-based.
What if the numbers have different lengths?
That is fine. The shorter side is treated as if it has leading zeros.
Why reject non-digits?
Malformed characters are rejected so the calculator does not silently change the math.
Can I multiply very large numbers?
Yes. The total uses BigInt, so large whole-number products remain exact.
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