Final answer:
When manipulating numbers, units should always accompany them to maintain meaning. Rounding is a critical tool in mathematics and chemistry, allowing for simpler calculations and easier expressions of numerical values.
Step-by-step explanation:
When dealing with numerical values, it's essential to always include the accompanying units to give context to the numbers. Moreover, we encounter various scenarios in mathematics and other disciplines, such as chemistry, where numbers need to be rounded.
Rounding helps us to manage numbers easily and convey information that is accurate enough for the context while being convenient to work with. Rounding numbers makes it possible to simplify calculations and to represent figures in a more manageable form.
Often, we come across numbers that have many decimal places which are cumbersome to write out in full. Rounding provides a practical way to express these numbers without losing significant accuracy. For instance, in transactions involving currency, precision to two decimal places is usually sufficient.