CRACK THE CODE · GRADE 4
Mission Control Codebreaker
Solve the cosmic shape equations using your math skills to find the missing four-digit code.
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 15. A number in front of a shape means multiply: 2 stars = 2 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
- 1.3+2=
- 2.(−)×=CODE 1
- 3.×=
- 4.×=CODE 2
- 5.100+=
- 6.×+=CODE 3
- 7.10−=
- 8.(−)×=CODE 4
- 9.10−=
- 10.3+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 navigation computer of.
Show answer key (for grown-ups)
Key: cross = 6 (hidden) · heart = 10 · square = 14 · ring = 11 · moon = 5 (hidden) · diamond = 9 (hidden)
Every symbol is a whole number from 1 to 15.
Vault code: 1550