# Long Multiplication Calculator

> Multiply whole integers exactly and display place-value partial products.

Page: https://askcalculators.com/calculator/long-multiplication-calculator/
Definition: https://askcalculators.com/calculator/long-multiplication-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/long-multiplication-calculator/schema.json
Version: 1.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/long-multiplication-calculator/?multiplicand=123456789012345&multiplier=98765

## Inputs
- multiplicand: Multiplicand; type=text; required; default=123456789012345
- multiplier: Multiplier; type=text; required; default=98765

## Outputs
- product: Exact product; format=text; primary
- partialCount: Partial products; format=integer

## Formula
product = multiplicand × multiplier using place-value partial products

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.