CRACK THE CODE · GRADE 2
Fossil Lab Code Breaker
Match the prehistoric dinosaur shapes to their correct numbers and solve the addition and subtraction puzzles to discover the four-digit security code.
Each shape stands for a number. 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
=8
=9
=10
=5
=1
Every symbol is a whole number from 1 to 10. A number in front of a shape means multiply: 2 stars = 2 x star.
Crack these
- 1.2−=
- 2.−=CODE 1
- 3.2+=
- 4.−=CODE 2
- 5.+−=
- 6.+2=CODE 3
- 7.3−=
- 8.2−=CODE 4
- 9.+?=11Which shape?
- 10.?+=19Which shape?
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 locked titanium incubator.
Show answer key (for grown-ups)
Key: moon = 8 · pentagon = 9 · ring = 10 · triangle = 5 · circle = 1
Every symbol is a whole number from 1 to 10.
1.2 x pentagon - triangle13
2.ring - triangle5
3.2 x pentagon + triangle23
4.pentagon - circle8
5.circle + moon - pentagon0
6.triangle + 2 x ring25
7.3 x ring - moon22
8.2 x ring - triangle15
9.circle + ? = 11ring
10.? + ring = 19pentagon
Vault code: 5855