Final answer:
To know if one shoe is smaller or bigger than the other, measure each shoe's length using a ruler and note the length in inches. Shoes are typically shorter than 12 inches, making the ruler a suitable tool for such measurements.
Step-by-step explanation:
To determine if the length of one shoe is smaller or bigger than the other, you should measure each shoe's length. Measuring options for this sort of comparison should be in inches, as shoes are typically smaller than a foot in length. You can use a ruler for this purpose since it is 12 inches long and provides a convenient way to measure in inches.
By placing each shoe against the ruler, one at a time, you can see which shoe is longer or shorter. However, if you're dealing with a small difference in length, you may also need to estimate to the nearest tenth of an inch, recognizing that there might be a slight uncertainty in the exact measurement.
Remember, when measuring objects, always try to match the appropriate unit with the object's size. In this case, it's clear that inches are the appropriate unit for measuring shoes.