Express the results of the following calculations with the correct number of significant figures. (e) 86.3 + 1.42 - 0.09

Key Concepts

Significant Figures

Significant figures are the digits in a number that contribute to its precision. This includes all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal portion. Understanding significant figures is crucial for accurately reporting measurements and calculations in chemistry, as it reflects the precision of the data.

Rules for Addition and Subtraction

When performing addition or subtraction, the result should be reported with the same number of decimal places as the measurement with the least number of decimal places. This rule ensures that the precision of the result is not overstated, maintaining the integrity of the data derived from the least precise measurement.

Order of Operations

The order of operations is a set of rules that dictates the sequence in which calculations should be performed to ensure consistent results. In the context of addition and subtraction, operations are typically performed from left to right. This concept is essential for correctly evaluating expressions and ensuring that significant figures are applied appropriately.