What can be placed between 3 and 9 to make a number bigger than 3 but smaller than 9?
A simple handwritten riddle is making the rounds online because it looks easy—but it forces you to think differently about how numbers can be written.
The question asks:
“What can be placed between 3 and 9 to make a number bigger than 3 but smaller than 9?”
At first, people try common math symbols like +, –, ×, or ÷, but none of those create a value that stays between 3 and 9 when placed directly between the two digits.
The Correct Answer
The trick is to stop thinking of “3 and 9” as separate numbers and instead form one number by inserting a symbol between the digits:
Answer: Put a decimal point (.)
That gives:
3.9
And it works because:
- 3.9 is bigger than 3
- 3.9 is smaller than 9
So the final solution is:
3.9
Why This Puzzle Works
This riddle is clever because it tests whether you’ll consider place value and number formatting, not just arithmetic operations. A single dot changes two separate digits into a decimal number, creating a value that fits perfectly within the required range.
Final Takeaway
If you ever see this question again, remember:
Place a decimal point between 3 and 9 to make 3.9, which is greater than 3 and less than 9.
