Operations with decimals may be solved by using addition, subtraction, multiplication or division. The same methods can be used when working with decimals and whole numbers although the decimal point must be tracked closely when solving operations with decimals to ensure the answer is correct.
With problems that involve decimals, using addition or subtraction to solve equations is often easier than using multiplication or division as the problems are generally less complex. With other math problems, setting up equations to ensure values line up properly is important, and even more so when working with decimals. When using addition to solve decimal equations, the numbers should first be lined up in the column by keeping decimal points in line. Then, add each column separately, beginning with the right hand side. Move from right to left to solve the equation, carrying the remainder to the next column, too. When subtracting operations with decimals, the first step is to line up the decimal points in a vertical line. As with addition, proceed to subtract down the columns, beginning on the right-hand side then moving left. When using multiplication to solve, decimals can be multiplied as whole numbers. The remaining decimal point indicated the total number of decimal places in the numbers multiplied.