CRACK THE CODE · GRADE 4
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 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.×=
- 2.3+2=CODE 1
- 3.(+)×=
- 4.10−=CODE 2
- 5.10−=
- 6.×=CODE 3
- 7.×−=
- 8.3+2=CODE 4
- 9.(−)×=
- 10.100+=
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: moon = 14 (hidden) · hexagon = 7 (hidden) · square = 4 (hidden) · star = 12 · lightning bolt = 11 · diamond = 6
Every symbol is a whole number from 1 to 15.
Vault code: 9960