CRACK THE CODE · GRADE 4
Space Cat Redstone Lock
Solve the symbol equations to calculate the values of the cosmic blocks and reveal the code for the lunar cat vault.
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.(+)×=
- 2.×=CODE 1
- 3.100+=
- 4.3+2=CODE 2
- 5.×=
- 6.×÷=CODE 3
- 7.×+=
- 8.100+=CODE 4
- 9.(+)×=
- 10.×−=
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 lunar cat vault.
Show answer key (for grown-ups)
Key: lightning bolt = 13 · cross = 12 · hexagon = 5 (hidden) · triangle = 3 · star = 11 (hidden) · square = 15 (hidden)
Every symbol is a whole number from 1 to 15.
Vault code: 0113