Understanding Decimal Concepts

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Compatible Numbers

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Numbers that are easy to compute mentally. Example: find a number that is close to .29

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Benchmark Numbers

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Common numbers used for estimating (like 0, 0.5, 1). Example: Is 0.83 closer to 0.5 or 1?

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Expanded Notation

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A way to break a number into a sum of each digit times its place value. Example Prompt: 0.47 = (4x.1)+(7x.07)

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Expanded Form

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A way to show the value of each digit using place value. Example Prompt: 0.47 = 0.4 + 0.07

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Standard Notation (standard form)

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The usual way of writing numbers with digits and a decimal point. Example Prompt: Write four tenths + seven hundredths in standard notation.

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Digits

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The individual numbers 0–9 that make up a number. Example Prompt: How many digits are in 0.47?

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Decimal

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A number with a whole part and a fractional part separated by a decimal point.

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Decimal Point

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The dot that separates the whole number from the fractional part in a decimal.

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Tenths

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The first place after the decimal point; 1/10. Example Prompt: In 0.47, what is in the tenths place?

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Hundredths

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The second place after the decimal; 1/100. Example Prompt: In 0.47, what is in the hundredths place?