CRACK THE CODE · GRADE 6
Crack the Vault Code
Someone locked the vault with a 4-digit code. Work out what each shape is worth and crack it.
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×(+)−=CODE 1
- 3.2+=
- 4.2+2=CODE 2
- 5.(+)2=
- 6.2×(+)−=CODE 3
- 7.2+=
- 8.(−)×(+)=CODE 4
- 9.2+2=
- 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 vault.
Show answer key (for grown-ups)
Key: lightning bolt = 17 (hidden) · moon = 13 (hidden) · ring = 10 (hidden) · hexagon = 4 · circle = 9 (hidden) · square = 18
Every symbol is a whole number from 1 to 20.
Vault code: 5013