Math Trivia

Guess the answers to the math trivia. Type the character e.g. 1, 2, & 3 to save time.

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Last updated: April 21, 2026

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Hint	Answer
What is the only number that can't be written in Roman numerals?	0
What number is considered bad luck in Asia?	4
What is the 1 billionth digit of pi?	9
Who is the father of mathematics?	Archimedes
What do you call an angle measuring more than 90°?	Obtuse
What is the only even prime number?	2
Which number is larger, googol or googolplex?	Googolplex
What is the longest side of a triangle?	Hypotenuse
What greek letter is used when calculating trigonomic functions?	Theta
How many sides does a dodecagon have?	12
Radii is the plural form of what part of a circle?	Radius
What is this sequence called: 1, 2, 3, 5, 8, 13, 21, 34...	Fibonacci
Which number looks the same when it's flipped upside down?	8
Which mathematician invented the Cartesian plane?	Rene Des Cartes
What do you call an arrangement of numbers where the order is important?	Permutation
What do you call an arrangement of numbers where the order is not important?	Combination
What does the symbol "<" mean?	Less than
What number is next in the sequence: 3, 9, 27, 81, __	243
What kind of angle is it when 2 angles add up to 90°?	Complementary
The letter "A" doesn't appear in the spelling of a number until what number?	1,000