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Long Multiplication Calculator for Multiplying Decimals, Integers, and Whole Numbers

Calculator Preferences
Long Multiplication Calculator Sign
Long Multiplication Calculator

This calculator will multiply two numbers, without or with decimals, positive or negative, and display the long multiplication method used to find the product of the two. Included in the results is an interactive tutorial explaining each step of the process.

The Learn section beneath the calculator uses an example multiplication to demonstrate, step-by-step, how to multiply numbers without a calculator.

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Selected Data Record:

A Data Record is a set of calculator entries that are stored in your web browser's Local Storage. If a Data Record is currently selected in the "Data" tab, this line will list the name you gave to that data record. If no data record is selected, or you have no entries stored for this calculator, the line will display "None".

DataData recordData recordSelected data record: None
Multiplicand:Multiplicand:Multiplicand:Multiplicand (most digits of 2 numbers):

Multiplicand:

Enter the multiplicand, which is the decimal, integer, or whole number having the greatest number of digits, up to a maximum of 99999999999 (11 digit maximum).

Multiplier:Multiplier:Multiplier:Multiplier (fewest number of digits):

Multiplier:

Enter the multiplier, which is the decimal, integer, or whole number having the fewest number of digits, up to a maximum of 9999999999 (10 digit maximum).

Product:Product:Product of decimals:Product of the two decimals:

Product of the two decimals:

This is the product of the two numbers you entered. Use this number to double-check the long multiplication form in the results. Since I can't test every possible combination of numbers and/or invalid character entries, be sure to check my work before considering the result to be accurate.

If you would like to save the current entries to the secure online database, tap or click on the Data tab, select "New Data Record", give the data record a name, then tap or click the Save button. To save changes to previously saved entries, simply tap the Save button. Please select and "Clear" any data records you no longer need.

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Help and Tools

Help and Tools:

This section, which you can Unstick or Hide in the Calculator Preferences (just above the top of the calculator), contains the following tabs (content too long to fit within bordered frame can be scrolled up and down):

About: Click this tab for an introduction to the calculator.

Instructions: Click this tab for step-by-step instructions for using the calculator.

Terms: Click this tab for a list of the descriptions that are located within each popup help button (info icons).

PCalc: Click this tab for a handy "pocket" calculator you can use when you need to calculate an entry needed for the calculator.

Data: Click this tab to save a set of entries or a note in between visits. Entries and notes will be stored to your web browser's local storage (if supported by your browser of choice), meaning they can only be recalled with the same device and web browser you were using when you saved them. If you'd like to save entries and notes between devices you can do so by subscribing to the Ad-Free Member Version.

 

Favorites

Add or remove this page to/from my favorites.

Adjust Calculator Width:

Move the slider to left and right to adjust the calculator width. Note that the Help and Tools panel will be hidden when the calculator is too wide to fit both on the screen. Moving the slider to the left will bring the instructions and tools panel back into view.

Also note that some calculators will reformat to accommodate the screen size as you make the calculator wider or narrower. If the calculator is narrow, columns of entry rows will be converted to a vertical entry form, whereas a wider calculator will display columns of entry rows, and the entry fields will be smaller in size ... since they will not need to be "thumb friendly".

Show/Hide Popup Keypads:

Select Show or Hide to show or hide the popup keypad icons located next to numeric entry fields. These are generally only needed for mobile devices that don't have decimal points in their numeric keypads. So if you are on a desktop, you may find the calculator to be more user-friendly and less cluttered without them.

Stick/Unstick Tools:

Select Stick or Unstick to stick or unstick the help and tools panel. Selecting "Stick" will keep the panel in view while scrolling the calculator vertically. If you find that annoying, select "Unstick" to keep the panel in a stationary position.

If the tools panel becomes "Unstuck" on its own, try clicking "Unstick" and then "Stick" to re-stick the panel.