Final answer:
To make the value of the digit "4" ten times greater than in the number 508.42, it should be placed in the ones position; for instance, in the number 540.
Step-by-step explanation:
The question asks for a number where the digit "4" has a value that is ten times greater than it does in the number 508.42. In 508.42, the digit "4" is in the tenths place, so its value is 4/10 or 0.4. To make the value of "4" ten times greater, it needs to be in the ones place, making its value 4. So, a number that satisfies this condition could be 540, where the "4" has a value of 4, which is ten times 0.4.