Final answer:
When adding or subtracting measurements, the resulting value should match the precision of the least precise measurement involved, considering the number of decimal places.
Step-by-step explanation:
When adding or subtracting measured values, it's important to consider the precision of those values. The basic principle is that the final answer cannot have more decimal places than the least precise value involved in the calculation. So, if you're working with whole numbers, you pay attention to the number of significant figures each value has after the decimal point.
For example, if you have two values, 3.12 (with two decimal places) and 4.1 (with one decimal place), and you want to add them, the result should be presented with only one decimal place, since 4.1 is the least precise measurement.