Writing the Number 1 Using All 10 Digits #shorts @Vsauce2

Uploaded October 2021 | Updated September 2026, 2 weeks ago

There are infinite ways to write the number 1 without even using a 1. But what's the simplest way to write 1 using all 10 digits 0 to 9?

You can do it with exponents, square roots, multiplication and division... really, anything goes. But the easiest, least-complicated way to get all 10 digits into a mathematical expression totaling 1 is to add two fractions that each equal one half.

#vsauce #education #maths

$Writing the Number 1 Using All 10 Digits #shorts There are infinite ways to write the number 1 without even using a 1. But whats the simplest way to write 1 using all 10 digits 0 to 9? You can do it with exponents, square roots, multiplication and division... really, anything goes. But the easiest, least-complicated way to get all 10 digits into a mathematical expression totaling 1 is to add two fractions that each equal one half. #vsauce #education #maths$

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$123!’s Zeroes Trick #shorts You can determine the number of trailing zeroes on a factorial of ANY size with a pretty simple trick that involves dividing by powers of 5. First, you can do it the hard way, and multiple every number of x! (x * (x - 1) * (x - 2)...) until youre multiplying by 1 at the end, and then just count up the zeroes. Or... you can do it the smart way. Divide your original number by 5, then 5^2, then 5^3, and when youve got a fractional value, stop and add up the rounded-down whole numbers. And BAM! Thats how many trailing zeroes x! has. It really is that easy, even for a 206-digit number like 123! #shorts$