Across
- 4. the only number which can not be represented by Roman numerals
- 7. a flat geometric figure of four sides and four angles
- 11. a number or algebraic expression that divides another number or expression evenly
- 13. a puzzle in which players insert the numbers one to nine into a grid consisting of nine squares subdivided into a further nine smaller squares
- 14. the four infinite regions divided by axes on a coordinate plane
- 17. a quantity representing the power to which a given number or expression is to be raised, usually expressed as a raised symbol beside the number or expression
- 18. the ____ sequence occurs when each number is the sum of the two preceding ones
- 19. a mathematical expression or function so related to another that their product is one
- 21. the only number that has letters in alphabetical order
Down
- 1. a system of numerical notation that has 2 rather than 10 as a base
- 2. 2D geometric shape that doesn't have any vertices
- 3. the longest side of a right triangle, opposite the right angle
- 5. the name of an angle of more than 90 degrees but less than 180 degrees
- 6. a symbol and placeholder for any mathematical object
- 8. the number of digits in pi
- 9. the opposite of an exponent that is represented with a symbol '√' also known as root
- 10. a result obtained by dividing one quantity by another
- 12. the only even prime number
- 15. one followed by 100 zeros
- 16. the other name for The International Day Of Mathematics
- 20. a common math term that means "for every one hundred" in Latin