CRACK THE CODE · GRADE 4
Spooky Mansion Vault Code
Solve the Halloween math equations to discover the hidden numbers and unlock the witch's secret potion safe.
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 15. 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
- 5.3+2=
- 6.100+=CODE 3
- 7.×=
- 8.3+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 witchs potion safe.
Show answer key (for grown-ups)
Key: pentagon = 5 · moon = 3 · square = 15 · hexagon = 7 (hidden) · diamond = 9 (hidden) · lightning bolt = 13 (hidden)
Every symbol is a whole number from 1 to 15.
Vault code: 2253