Archive · Wednesday, October 21, 2026

Hunch #21

For each question, give a low and a high you are 80% sure the answer sits between. Tighter brackets score more; a miss scores zero. You can type 2 million, 3e9, 1.5k or 45%.

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InterestQuestion 1 of 8

You put $1,000 in an account that pays 4% a year, added once a year, and never touch it. What is it worth after 24 years, in dollars?

Low High dollars

OrdersQuestion 2 of 8

In how many different orders can 9 different books stand in a row on a shelf?

Low High orders

CalendarQuestion 3 of 8

How many days after March 28, 1817 is August 2, 1821?

Low High days

BirthdaysQuestion 4 of 8

35 people are in a room. Counting all 365 birthdays as equally likely (ignore February 29), what is the chance, in percent, that at least two of them share a birthday?

Low High percent

FoldingQuestion 5 of 8

A sheet of paper 0.1 mm thick is folded in half 17 times (pretend that is possible: ordinary paper is hard to fold more than 7 or 8 times). How thick is the folded stack, in metres?

Low High metres

Head mathsQuestion 6 of 8

What is 1 + 2 + 3 + … + 53,329 (every whole number up to 53,329 added together)?

Low High

DiceQuestion 7 of 8

You roll one fair six-sided die 13 times. What is the chance, in percent, of rolling at least one six?

Low High percent

PackingQuestion 8 of 8

How many 1-inch cubes fit, packed perfectly with no gaps, in a box 2 ft long, 4 ft wide and 4 ft tall?

Low High cubes

No Hunch Book on this browser: you can keep the score in a new one after you see it.