Alien Equations
A game of logic, mental calculation, and teamwork... interplanetary!
=14
A team member secretly thinks of a number from 1 to 100.
Create the secretmessage
+ 2
- 3
x 7
+ 4
Each team member, in turn, proposes and writes down a single simple arithmetic operation.
The rest, choose a single operation
91 + 4 = 95
13 x 7 = 91
Mental calculation
The person who knows x, performs all operations mentally in order, without hints or intermediate results; only listens and calculates.
16 - 3 = 13
14 + 2 =16
95 !
When all operations have been set, the person who thought of the number provides the final result after applying all operations, one after another.
Reveal the result
91/7=13
95-4 =91
- 4 / 7 + 3 - 2
+ 2 - 3 x 7 + 4
¡ 14 !
13+3=16
16-2=14
The team must discover the initial number by working together and using inverse logic. Great!
Decode the message
Advanced Mode
At a Glance
"Alien Equations" is a collaborative mental calculation game where one team member thinks of a number between 1 and 100 and secretly applies arithmetic operations (add, subtract, multiply, divide) that, in turn, are proposed by the rest of the group—each person only asks once and notes their operation in the notebook—; at the end of the round, the person who knows the number reveals only the final result and, based on that data, the team uses inverse reasoning to discover the original number. This works on quick mental calculation, mathematical expression, logic, and cooperation.
Here are three other game modes if you want to increase the fun: - Add operations with decimals or fractions.
- Ask for an equation instead of the exact number.
- Give only the result… and a false hint.
Use them separately or combined.
Alien Equations: Collaborative Math Challenge
Jonhy Walker
Created on March 28, 2026
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Transcript
Alien Equations
A game of logic, mental calculation, and teamwork... interplanetary!
=14
A team member secretly thinks of a number from 1 to 100.
Create the secretmessage
+ 2
- 3
x 7
+ 4
Each team member, in turn, proposes and writes down a single simple arithmetic operation.
The rest, choose a single operation
91 + 4 = 95
13 x 7 = 91
Mental calculation
The person who knows x, performs all operations mentally in order, without hints or intermediate results; only listens and calculates.
16 - 3 = 13
14 + 2 =16
95 !
When all operations have been set, the person who thought of the number provides the final result after applying all operations, one after another.
Reveal the result
91/7=13
95-4 =91
- 4 / 7 + 3 - 2
+ 2 - 3 x 7 + 4
¡ 14 !
13+3=16
16-2=14
The team must discover the initial number by working together and using inverse logic. Great!
Decode the message
Advanced Mode
At a Glance
"Alien Equations" is a collaborative mental calculation game where one team member thinks of a number between 1 and 100 and secretly applies arithmetic operations (add, subtract, multiply, divide) that, in turn, are proposed by the rest of the group—each person only asks once and notes their operation in the notebook—; at the end of the round, the person who knows the number reveals only the final result and, based on that data, the team uses inverse reasoning to discover the original number. This works on quick mental calculation, mathematical expression, logic, and cooperation.
Here are three other game modes if you want to increase the fun:
- Add operations with decimals or fractions.
- Ask for an equation instead of the exact number.
- Give only the result… and a false hint.
Use them separately or combined.