Recently, a digital puzzle from Harvard University has set off a heated discussion on the Internet! This problem seems simple, but 90% of the participants are stumped, and even many math masters are struggling to think about it!

Most people's first reaction is:

• Think that the question is wrong, 11×11 is 121

• Try to find rules of operation other than squares

• Entangled in the special nature of the numbers themselves

But the correct answer is 36! What the hell is going on?

Key to the problem:

This question is not a test of traditional multiplication, but a test of the decomposition and reorganization of numbers! The correct solution is:

1. Split each number into single digits and add them up:

◦ 11 → 1 1=2

◦ 22 → 2 2=4

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