There is a whole number n for which the following holds: if you put a 4 at the end of n, and multiply the number you get in that way by 4, the result is equal to the number you get if you put a 4 in front of n. In other words, we are looking for the number you can put on the dots in the following equation:

4... = 4 × ...4

The question: Which number must be put on the dots to get a correct equation?

The answer: Click here!

Another question: If there is a 6 in the equation instead of a 4 (6... = 6 × ...6) which number must you then put on the dots to get a correct equation?

Another answer: Click here!