Quick guide
How to use this calculator
- Enter a non-negative multiplicand.
- Enter a non-negative multiplier.
- Open the working to inspect per-digit products, carries, and shifted rows.
Calculation method
Each multiplier digit creates one shifted product
The calculator multiplies the first integer coefficient by each digit of the second, records the carries, and shifts each row according to that digit's place.
It sums those rows and restores the decimal point from the combined fractional scales. This page reuses the verified long-multiplication engine.
Worked example
Build 23 × 14 from partial products
The ones digit contributes 92 and the tens digit contributes 230; their sum is 322.
23 × 14 = (23 × 4) + (23 × 10) = 92 + 230 = 322
Supported inputs
Precision and limits
Exact decimals
Each factor may contain up to 200 digits and 100 decimal places.
Non-negative inputs
This written layout accepts zero and positive whole numbers or decimals.
Visible working
Per-digit multiplication, carries, shifts, and the final sum are exposed.
Clear syntax
Grouping separators, fractions, and scientific notation are not accepted.