A few users believed they had cracked the code. “It’s simple if you notice the pattern—multiply the number by itself, then subtract it,” one user explained. Meanwhile, another joked, “I was good at ...

But there are tricks for multiplication (and percentages) that can help you get to the answer more quickly. One of these went viral on X recently, which turns multiplication into a simple game of ...

Check out another double-digit multiplication trick with Rachel's maths hack for the 11 times table.