DECIMALS Review of Introductory MathematicsAdditionandSubtractionofDecimalsWhen adding or subtracting decimals, each number must be placed to align the decimal points.When necessary, zeros are used as place holders to make this possible. Then the operation ofaddition or subtraction is performed.Example:0.423 + 1.562 + 0.0736 + 0.2 =Solution:Align decimal points0.42301.56200.07360.20002.2586Example:0.832 - 0.0357 =Solution:0.83200.03570.7963MultiplyingDecimalsWhen multiplying decimals, the decimal points do not have to be aligned. Rather, it is importantto accurately position the decimal point in the product. To position the decimal in the product,the total number of digits to the right of the decimals in the numbers being multiplied must beequal to the number of digits to the right of the decimal in the product. This is best illustratedin the following examples:Step 1: Multiply numbers without inserting decimal in the products.Step 2: Sum the number of digits to the right of the decimal in all of the numbersbeing multiplied.Step 3: Position the decimal in the product so the number of digits to the right ofthe decimal equals the total number of digits to the right of the decimal inthe numbers multiplied (from Step 2).MA-01 Page 42 Rev. 0

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