Basic Operations with Decimals

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What is a decimal?

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A decimal is a fraction expressed in a special form, where the denominator is a power of ten. It is used to represent numbers that are not whole, such as 0.5 or 3.14.

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How do you add decimals?

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To add decimals, align the numbers by the decimal point and add as you would whole numbers, placing the decimal point in the sum directly below the other decimal points.

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CCSS.5.NBT.B.7

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How do you subtract decimals?

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To subtract decimals, align the numbers by the decimal point and subtract as you would whole numbers, placing the decimal point in the difference directly below the other decimal points.

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CCSS.5.NBT.B.7

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CCSS.6.NS.B.3

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How do you multiply decimals?

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To multiply decimals, multiply the numbers as if they were whole numbers, then count the total number of decimal places in both numbers and place the decimal point in the product accordingly.

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CCSS.6.NS.B.3

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CCSS.6.NS.B.3

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What is the importance of the decimal point?

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The decimal point separates the whole number part from the fractional part of a decimal number, indicating the value of each digit.

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CCSS.5.NBT.A.3A

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What is rounding in decimals?

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Rounding is the process of adjusting the digits of a decimal number to make it simpler while keeping its value close to what it was.

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