Answer:
Because you will get whole numbers in milimeters.
Step-by-step explanation:
Since a penny is small, you would need to use small units to measure it, otherwise you will end up with a scientific notation number, or with large decimals in order to be able to express its measurements, with milimeters you will only get whole numbers and can be more exact.
Because the measure would be easier to read, as the order of magnitude of the penny is in the millimeters range.
As you already know, the height of the penny measures only a few millimeters, about 1.5mm, and the diameter measures about 18mm.
You can notice that when we write it in millimeters we get nice rounded numbers.
While if we wrote these in cm (you need to divide everything by 10) you would get:
We still have nice numbers, but the zeros in the left side of the decimal point are things that we usually try to avoid.
If we wrote these measures in meters (divide the above ones by 100), we get:
Now you can see that we have a lot of zeros that we don't need and only complicate the calculations, this is why is better to use order of magnitudes that are closer to the dimensions we are measuring.
If you want to learn more about orders of magnitude, you can read:
https://brainly.com/question/1542614
