TikTok users are sharing an addition problem that seems easy enough at first glance, but people's mental arithmetic skills get tripped up by the same part of it. All you have to do is add up the following numbers—that's seriously it. Try it for yourself:

1,000

40

1,000

30

1,000

20

1,000

10

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If you came up with 5,000, then congratulations: You're not alone.

In one of the best puzzle board games of the year, you and up to three other players attempt to craft the stained glass windows of the Sagrada Familia.

This fast-paced 3-D puzzle game involves a combination of quick thinking, logic, and luck to stack your spheres to earn the most points.

The actual right answer is 4,100.

See, it's remarkably straightforward to add up the first bunch of numbers in your head. 1,000 plus 40 is 1,040, plus 1,000 is 2,040, plus 30 is 3,070, plus 1,000 is 3,070, plus 20 is 3,090, plus 1,000 is 4,090. But it's at this penultimate sum that things get tricky.

Most people, when adding 10 to that figure, come up with 5,000. But that's your brain skipping ahead (and overlooking a zero). The correct sum is actually, of course, 4,100.

If you got the answer wrong, don't feel too bad. So did these people:

This content is imported from TikTok. You may be able to find the same content in another format, or you may be able to find more information, at their web site.

This content is imported from TikTok. You may be able to find the same content in another format, or you may be able to find more information, at their web site.

This content is imported from TikTok. You may be able to find the same content in another format, or you may be able to find more information, at their web site.

Philip EllisPhilip Ellis is a freelance writer and journalist from the United Kingdom covering pop culture, relationships and LGBTQ+ issues.

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