CRACK THE CODE · GRADE 7
The Cooperstown Trophy Vault
Use your algebra skills to determine the numerical values of the glove, bat, diamond, and baseball symbols to reveal the four-digit combination to the stadium championship ring 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 -9 to 20 (some are negative!). A number in front of a shape means multiply: 2 stars = 2 x star. A small 2 after a shape means square it: star^2 = star 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.+=
- 6.×(−)=CODE 3
- 7.×−=
- 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 stadium championship ring.
Show answer key (for grown-ups)
Key: pentagon = 6 · moon = 20 (hidden) · hexagon = 10 (hidden) · diamond = -6 (hidden) · circle = 12 · lightning bolt = -4
Every symbol is a whole number from -9 to 20 (some are negative!).
Vault code: 0006