CRACK THE CODE · GRADE 3
The Skull Cove Codebreaker
Find the hidden number value of each pirate symbol to unlock the iron-banded sea chest before the tide rolls in.
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.++=CODE 1
- 3.2+=
- 4.×+=CODE 2
- 5.3−=
- 6.2+=CODE 3
- 7.10+=
- 8.3−=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 iron-banded sea chest.
Show answer key (for grown-ups)
Key: hexagon = 4 · moon = 8 (hidden) · ring = 2 · pentagon = 6 · cross = 5 (hidden) · square = 12
Every symbol is a whole number from 1 to 12.
Vault code: 9008