Math trivia is the category people fear for no good reason: not one of these questions requires a calculator, just nerve. Cover the answers, lock in a guess before each reveal, and keep score. The playing card one is going to bother you all day.

What famously enormous number was named by a nine-year-old in the 1920s?

The googol — a 1 followed by 100 zeros. Mathematician Edward Kasner asked his young nephew Milton to christen it.

How did Milton originally define the even bigger googolplex?

"One, followed by writing zeroes until you get tired" — his uncle tightened that to 10 raised to the googol power.

Roman numerals have no symbol for which fundamental number?

Zero — it was first treated as a true number in India, where Brahmagupta wrote out its rules around AD 628.

What is the only even prime number?

2 — every other even number is divisible by it, which disqualifies them all.

Is 1 a prime number?

No — modern math defines a prime as having exactly two divisors, and 1 only has one. Mathematicians formally evicted it about a century ago.

How big is the largest known prime number?

Over 41 million digits — a Mersenne prime found in 2024: two multiplied by itself 136,279,841 times, minus one.

Does 0.999…, repeating forever, equal 1?

Yes — exactly, not approximately. It's the same number wearing a different outfit.

How many people must be in a room before a shared birthday becomes more likely than not?

Just 23 — the famous "birthday paradox," and yes, the math checks out.

Shuffle a deck of cards thoroughly. Has that exact order ever existed before?

Almost certainly not — 52 cards can be arranged about 8 × 10⁶⁷ ways, so every honest shuffle is likely a first in human history.

A million seconds is about 11 and a half days. How long is a billion seconds?

Almost 32 years — the gap between millionaires and billionaires, told in clock time.

What is the volume of a pizza with radius z and thickness a?

Pi × z × z × a — the formula literally spells pizza.

Which letter of the alphabet appears in the spelling of every odd number?

E — check any of them: one, three, five, seven, nine, and on forever.

In medieval England, buying a "hundred" of fish or nails could get you how many?

120 — the old Germanic "long hundred," which made every deal a word problem.

Count the seed spirals in a sunflower's head and what do you usually find?

Consecutive Fibonacci numbers — commonly 34 curving one way and 55 the other.

If the googol stuck with you, good: you'll think of nine-year-old Milton every time you type its famous misspelling into a search bar — which is to say, today.