CRACK THE CODE · GRADE 6
Robot Core Decryption Challenge
Calculate the value of each android symbol to find the four-digit passcode for the central server room.
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=
- 2.3−=CODE 1
- 3.3−=
- 4.(−)×(+)=CODE 2
- 5.×−2=
- 6.3=CODE 3
- 7.3=
- 8.2+2=CODE 4
- 9.(+)2=
- 10.2+=
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 server security.
Show answer key (for grown-ups)
Key: pentagon = 18 (hidden) · heart = 6 (hidden) · lightning bolt = 19 · star = 14 (hidden) · moon = 13 (hidden) · circle = 15
Every symbol is a whole number from 1 to 20.
Vault code: 1575