CRACK THE CODE · GRADE 6
Mainframe Decryption Protocol
Calculate the numerical value of each robot part symbol to solve the equations and reveal the four-digit access key.
Each shape stands for a number. Work out the missing ones first, then solve the shape equations and read off the 4-digit code. Do it here or print the sheet — the answer key comes with it.
The key
Every symbol is a whole number from 1 to 20. A number in front of a shape means multiply: 2 stars = 2 x star. A small 2 after a shape means square it: star^2 = star x star.
Find the missing values
Some shapes in the key are missing. Use these equations to work them out, then write them into the key. Take them in order.
Crack these
- 1.2+=
- 2.3−=CODE 1
- 3.3−=
- 4.3=CODE 2
- 5.2+2=
- 6.(−)×(+)=CODE 3
- 7.2+=
- 8.(+)2=CODE 4
- 9.2−2=
- 10.2+2=
The vault code
Take the ones digit of your answers to problems 2, 4, 6, 8 (the ones tagged CODE 1–4), in that order. That opens the central mainframe core.
Show answer key (for grown-ups)
Key: circle = 5 (hidden) · triangle = 20 (hidden) · diamond = 14 (hidden) · lightning bolt = 16 · heart = 9 (hidden) · ring = 4
Every symbol is a whole number from 1 to 20.
Vault code: 6611