What is a value of the 7 in that number?

In a multi-digit number, the value of a digit depends on its position within the number. The value of the 7 in a number like 573 would be 70, as it is in the tens place. This is because each place value to the left of the decimal point is 10 times greater than the one to its right. Therefore, the 7 in the tens place has a value of 7 * 10 = 70.