CRACK THE CODE · GRADE 5
Redstone Block Decoder
Solve the math equations to determine the numeric value of each item and unlock the ancient obsidian vault.
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
- 3.10−=
- 4.×+×=CODE 2
- 5.÷2+=
- 6.×−=CODE 3
- 7.3+2=
- 8.(+)×=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 enchanted obsidian vault.
Show answer key (for grown-ups)
Key: circle = 12 (hidden) · pentagon = 4 (hidden) · diamond = 9 · lightning bolt = 17 (hidden) · cross = 16 · heart = 7
Every symbol is a whole number from 1 to 20.
Vault code: 3054