Decimal operations involve basic mathematical calculations using decimal numbers, which are numbers that include a decimal point. The main operations include addition, subtraction, multiplication, and division. When performing these operations, it is important to align the decimal points for addition and subtraction, while for multiplication, the total number of decimal places in the result is determined by the sum of the decimal places in the numbers being multiplied. In division, the goal is to convert the divisor into a whole number by moving the decimal point, which also shifts the decimal point in the dividend. Understanding decimal operations is essential for everyday tasks, such as budgeting and measuring, as they provide a way to work with fractions of whole numbers in a precise manner.