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Missing Numbers Calculator

Tool/Solveur to find missing number/fill the blanks puzzles/equations (addition, subtraction, multiplication, division)

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Missing Numbers Calculator -

Tag(s) : Number Games, Arithmetics

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# Missing Numbers Calculator

## Find the Missing Digits Solver

Use '?' for each missing digit, for a 2-digit number write '??'

## Find x in an Equation Solver

The missing digits solver is not an equation solver, it only looks for missing digits from 0 to 9. For other cases, use dedicated tool:

⮞ Go to: Equation Solver

### What is a calculation with blanks? (Definition)

A calculation with blanks (such as an addition, a subtraction, a multiplication, or a division) is a math exercise that involves finding the missing numbers and digits.

There is a variant where the operators (+ - * /) are missing.

### How to solve a calculation with blanks?

Solving a calculation with operators and missing digits is similar to a cryptarithm and uses deduction and extraction of parts of the calculation.

Example: Exercise: find ? in the operation ??5 + 42? = 539 => 115 + 424 = 539

Example: 12 + 23 = ? has no solution but 12 + 23 = ?? has for solution 12 + 23 = 35

It is useful to calculate digits at extremities, or check individually calculations to the ten digits, or the hundreds digit etc.

dCode also has a cryptarithm solver (where blanks are letters), a mathematical equation solver or even a countdown game calculation tool.

### How does the missing numbers solver works?

dCode solver allow usual operators like additions +, subtractions -, multiplications * and divisions /. It also handles comparison operators superior and inferior > and <.

The blanks have to be replaced by ? (interrogation marks). There is no limit but above 7 or 8, the calculation will be very long.

Example: 1+?=3 is solved with 1+2=3

Example: 2*?=8 is solved with 2*4=8

This solver uses a brute-force method, this means that it tries all combinations and display the possible ones.

## Source code

dCode retains ownership of the online "Missing Numbers Calculator" source code. Except explicit open source licence (indicated CC / Creative Commons / free), the "Missing Numbers Calculator" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or the "Missing Numbers Calculator" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, copy-paste, or API access for "Missing Numbers Calculator" are not public, same for offline use on PC, tablet, iPhone or Android ! Remainder : dCode is free to use.

## Need Help ?

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