# 5. Write decimal numbers in expanded notation (FP)

teaches Common Core State Standards CCSS.Math.Content.5.NBT.A.3a http://corestandards.org/Math/Content/5/NBT/A/3/a
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Lesson objective: Write decimal numbers in expanded notation, representing each digit’s value as a product of the digit itself and a decimal fraction.

This lesson helps to build procedural skill with expanded notation of a decimal number using fractions. Place value chart is used here because it visually supports the idea of the values of individual digits within a number. This work develops students' understanding that when the place value extends to thousandths, the structure does not change.

Students engage in Mathematical Practice 7 (Look for and make use of structure) as they evaluate and demonstrate each digit's value through the expanded notation of a number using fractions.

Key vocabulary:

• decimal

• digit

• expanded notation

• hundredths

• tenths

• thousandths

• value of a digit

Special materials needed:

• place value chart
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