CRACK THE CODE · GRADE 3
Deep Space Signal Decoder
Decode the alien symbols by solving the math equations to find the launch sequence for the starship.
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.×+=
- 4.5−=CODE 2
- 5.5−=
- 6.10+=CODE 3
- 7.10+=
- 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 cargo hold of.
Show answer key (for grown-ups)
Key: diamond = 7 (hidden) · circle = 10 · lightning bolt = 11 · pentagon = 6 · star = 9 (hidden) · moon = 4
Every symbol is a whole number from 1 to 12.
Vault code: 2573