CRACK THE CODE · GRADE 5
Pirate Captain's Chest Code
Solve each symbol equation to discover the four digit combination that unlocks the captain's ironbound treasure 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 20. 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.×−×=
- 4.×−×=CODE 2
- 5.10−=
- 6.3+2=CODE 3
- 7.××=
- 8.÷2+=CODE 4
- 9.10−=
- 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 captain blackbeards sunken.
Show answer key (for grown-ups)
Key: star = 10 · pentagon = 15 · cross = 5 (hidden) · heart = 16 (hidden) · triangle = 14 · moon = 20 (hidden)
Every symbol is a whole number from 1 to 20.
Vault code: 5023