Introduction

If you’re like many people, you’re probably glad the days of solving tricky math problems are long behind you. While some enjoy numbers and logic, others prefer creativity over calculations. Still, online puzzles have a way of drawing people in, turning simple challenges into hours of curiosity and debate.

This particular math puzzle has left thousands scratching their heads. The challenge looks simple at first glance but quickly becomes confusing depending on how you approach it:

• 1 + 4 = 5

• 2 + 5 = 12

• 3 + 6 = 21

• 5 + 8 = ?

What answer did you get? Before you scroll down, take a second to look at the pattern. There are actually two common ways to solve this!

Method 1: The “Running Total” (Answer: 34)

Many people arrive at the answer 34 by adding the sum of the previous equation to the numbers in the next line:

• 1 + 4 = 5

• Take that 5, and add it to the next line: 5 + (2 + 5) = 12

• Take that 12, and add it to the next line: 12 + (3 + 6) = 21

• Finally, take 21, and add it to the last line: 21 + (5 + 8) = 34

Method 2: The “Hidden Multiplication” (Answer: 45)

This method uses a consistent formula for every line: a + (a × b). This is often considered the “stronger” logic because each line works independently:

• 1 + (1 × 4) = 5

• 2 + (2 × 5) = 12

• 3 + (3 × 6) = 21

• 5 + (5 × 8) = 45

The Verdict: Which is Correct?

What makes this puzzle viral is that it doesn’t have just one universally accepted solution. Instead, it challenges how you think about patterns. While 34 is a popular observation, 45 is frequently cited by mathematicians as the more “algebraically sound” answer because it follows a standalone rule.

There is also a debate that if you fill in the “missing” numbers in the sequence (4+7), the first method would also eventually lead you to 45!

Which result did you get first? Let us know in the comments and share this with a friend to see if they are part of the 2% who can spot the pattern!