Across
- 3. a branch of mathematic that study the properties of the traditional operations on numbers
- 5. a riddle
- 7. an ancient Greek mathematician, a geometer and logician. The "father of geometry"
- 8. to think carefully about something
- 10. a universally accepted principle or rule.
Down
- 1. when something is not concrete it is..
- 2. an area of interest or activity.
- 4. when you can touch something it is ...
- 6. the furthest planet from the Sun in our Solar System
- 9. number can be positive or...