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

Missing Numbers Calculator - dCode

Tag(s) : Number Games, Arithmetics

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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.

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.

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.

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.

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Source : https://www.dcode.fr/missing-numbers-calculator

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