CRACK THE CODE · GRADE 3
Mystery of the Croatoan Chest
Solve the symbol equations to reveal the four-digit code that unlocks Governor John White's lost wooden supply chest.
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 12. 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−=CODE 1
- 3.++=
- 4.5−=CODE 2
- 5.×−=
- 6.5−=CODE 3
- 7.×+=
- 8.×=CODE 4
- 9.2+=
- 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 governor whites lost.
Show answer key (for grown-ups)
Key: pentagon = 10 · square = 11 · circle = 2 · star = 4 · lightning bolt = 6 (hidden) · hexagon = 7 (hidden)
Every symbol is a whole number from 1 to 12.
Vault code: 3842