MEET THE DEVELOPER
How to be Brilliant
Brilliant: Learn by doing
Get smarter in math and CS
Unlike many people – okay, unlike practically anyone – Sue Khim counts maths and long car rides among her fondest childhood memories.
The cofounder and CEO of the STEM learning app Brilliant was a maths kid through and through, but she found herself frustrated by all the traditional rote memorisation methods that teachers relied on.
Abstract maths challenges appealed to her – especially the ones posed by her father, who on family road trips would casually fire off questions like, “What’s the sum of all the numbers between 1 to 100?”
“My kid brain starts adding one to 10, and I’m quiet for a long time,” Khim recalls. “Then my dad says, ‘Try solving it from the outside in,’ and it became a much easier problem.” (For an explanation of what he meant, see the solution at the end of this story.*) Intrigued by the merging of maths and mystery, Khim was hooked. “So much of what I remember about my childhood is these blissful, long car rides,” Khim says. “I learned that a lot of maths is about learning a new way to see it.”
My goal is to re-create what was magical for me, to find that ‘Aha!’ moment.
Sue Khim
With her app, Brilliant, she’s helping others see it that way too. Khim designed it to shatter the notion that the subject is intimidating or impenetrable. Through novel problems and games, Brilliant teaches maths, science and computer science to everyone, from professionals looking for a career change to precocious 10-year-olds. (Really. Khim says Brilliant has a bunch of those.) It does so by recasting math as a puzzle to be unlocked. “My goal is to re-create what was magical for me, to find that ‘Aha!’ moment,” she says. “That was my experience with maths, but in talking to customers, I’ve learned that this is definitely not most people’s,” she says with a laugh. In the beginning, Khim’s experience was similar to her customers’. After high school, she read maths at the University of Chicago. But the entrepreneur in her called. She left after three years to launch a web app called Alltuition, which set out to connect students with financial aid. Brilliant followed two years later.
We cover everything from fundamentals to advanced topics, and we offer this dash of magic to make it fun,” she says of Brilliant. “Without strong pedagogy, our aspirations would just be entertainment. But without the fun, we just come back to ‘maths is scary’. Balancing that is one of the most difficult parts of our job.”
In Brilliant, it’s fine to fail. A lot. “Part of what we’re trying to do is show you it’s OK to make mistakes,” says Khim. “That’s the opposite of what you learned at school, which is: there’s a cost to every mistake. But no matter what you do, you’re going to be given choices where there’s no obvious right answer, and you just have to figure it out.”
Khim hears from all manner of satisfied maths aficionados: a woman who tutors maths students on three continents, an 80-year-old grandfather who solves its puzzles for fun at home, a CEO who saw the app at a party, a live-streamer taking a break from videogames. She’s had emails from former cabinet members and university presidents.
Today, Brilliant has more than 9 million registered users and nearly 2 million people use the app each month. Those are numbers Khim likes a lot too.
*This question comes from German mathematician Carl Friedrich Gauss, who noticed if you put every number from 1 to 100 into two groups (1 to 50 and 51 to 100), you can add one number from each group to get 101: That is, 1+100=101, 2+99=101, and onward to 50+51=101. So, the total sum is 50 x 101, or 5050.