Search for a tool
Missing Numbers Calculator

Tool/Solveur to find missing number/fill the blanks puzzles/equations. Calculator with missing numbers (blanks) solves addition, subtraction, multiplication, division as a mathematical puzzle which consists in finding the missing number or digit.

Results

Missing Numbers Calculator -

Tag(s) : Number Game, Arithmetics

Share dCode and you

dCode is free and its tools are a valuable help in games, maths, geocaching, puzzles and problems to solve every day!
A suggestion ? a feedback ? a bug ? an idea ? Write to dCode!

Team dCode likes feedback and relevant comments; to get an answer give an email (not published). It is thanks to you that dCode has the best Missing Numbers Calculator tool. Thank you.

# Missing Numbers Calculator

## Find x in an Equation Solver

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

Tool/Solveur to find missing number/fill the blanks puzzles/equations. Calculator with missing numbers (blanks) solves addition, subtraction, multiplication, division as a mathematical puzzle which consists in finding the missing number or digit.

### How to solve a calculation with blanks?

Solving is similar to a cryptarithm and uses deduction and extraction of parts of the calculation.

Example: ??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 comparators 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 source code of the script Missing Numbers Calculator online. Except explicit open source licence (indicated Creative Commons / free), any algorithm, applet, snippet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in any informatic langauge (PHP, Java, C#, Python, Javascript, Matlab, etc.) which dCode owns rights will not be released for free. To download the online Missing Numbers Calculator script for offline use on PC, iPhone or Android, ask for price quote on contact page !