Final answer:
In the number 745, the value of 4 is 40, which represents four tens.
Step-by-step explanation:
The value of 4 in the number 745 is in the tens place, which means it represents 40 or four tens. Understanding the place value is crucial in mathematics when it comes to operations like addition, subtraction, multiplication, and division. In the context of significant figures and scientific notation, each number in a multi-digit number has a specific value based on its position.