Archive · Saturday, October 31, 2026

Hunch #31

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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Head mathsQuestion 1 of 8

Without a calculator: what is 927 × 4,089?

Low High

DoublingQuestion 2 of 8

There is 1 paper clip on day 1, and the number doubles every day (2 on day 2, 4 on day 3). How many paper clips are there on day 16?

Low High paper clips

BirthdaysQuestion 3 of 8

45 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

PackingQuestion 4 of 8

How many 1-inch cubes fit, packed perfectly with no gaps, in a box 5 ft long, 2 ft wide and 5 ft tall?

Low High cubes

DiceQuestion 5 of 8

You roll one fair six-sided die 2 times. What is the chance, in percent, of rolling at least one six?

Low High percent

CalendarQuestion 6 of 8

How many days after February 5, 1865 is February 16, 1966?

Low High days

FoldingQuestion 7 of 8

A sheet of paper 0.1 mm thick is folded in half 27 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

InterestQuestion 8 of 8

You put $250 in an account that pays 7% a year, added once a year, and never touch it. What is it worth after 46 years, in dollars?

Low High dollars

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