Add or subtract as indicated. 3.87 + 15 + 2.9

Key Concepts

Addition of Decimals

Addition of decimals involves aligning the numbers by their decimal points and adding each column starting from the right. It is essential to ensure that each number has the same number of decimal places, which may require adding zeros. This process helps maintain accuracy in the sum.

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 this case, since only addition is involved, the operations can be performed from left to right without concern for parentheses or other operations.

Combining Like Terms

Combining like terms refers to the process of adding or subtracting numbers that have the same value or type. In the context of this question, it means summing the decimal values together to find a single total, which simplifies the expression and provides a clear answer.