Final answer:
The order of magnitude of the number of pennies equivalent to a quarter is 100.
Step-by-step explanation:
The order of magnitude of a number refers to the scale of the value expressed in the metric system. In this case, we can determine the order of magnitude of the number of pennies equivalent to a quarter by comparing their values. A quarter is worth 25 cents, and since there are 100 pennies in a dollar, we can say that there are 100 pennies in a quarter. Therefore, the order of magnitude of the number of pennies equivalent to a quarter is 10^2 or 100.