Reading & Writing Decimals

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TenthsOnes

Decimal

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Lets take a look at the places and the values of decimals.

1

Tens

10

Hundredths

.01 .001

Thousandths

Decimal Place Values

Reading & Writing Decimals1. Say or write the number before the

decimal point.2. Say or write “and” when you get to the

decimal point.3. Say or write the number after the decimal

point.4. Say or write the name of the place that

the decimal ends in. (tenths, hundredths, thousandths)

Example

8,243.67Eight thousand, two hundred forty-three

“and”sixty-seven hundredths

Lets Practice:

247.017

16.3

4,764.52

63,920.143

two hundred forty-seven and seventeen thousandths

.

sixteen and three tenths

Four thousand, seven hundred sixty-fourand fifty-two hundredths

Sixty-three thousand, nine hundred twenty andone hundred forty-three hundredths

From Words to Standard Form

Read everything that comes before the word “and.” Write that number down.

Place a decimal point at the word “and.”Read the last word of the sentence to

see how many decimal places you need.Fill in the decimal places as far to the

right as possible with your number, then use zeroes to fill any empty spaces.

Example: Write the following number in standard form:

two hundred six and five thousandths

206 .The word “thousandths” indicates that we need three decimal places.

__ __ __ 5 0 0

When we clean it up, the answer is 206.005

Lets Practice:

Six hundred fifty-three and twenty-three hundredths

Fourteen and five tenths

Three thousand, nine hundred thirty-five and sixty-one thousandths

653.23

14.5

3,935 .061

Expanded Form

Write the number that appears before the decimal point in expanded form.

For numbers that are decimals only, place a zero in the ones place.

Also, substitute zeroes for all spaces after the decimal point that come before the digit that you are working with.

Example: Write 13.361 in expanded form.

Remember, deal with the number before the decimal first.

10 + 3Then, do the decimal part.

0.060.3 ++ + 0.001

Lets Practice:

249.617

16.3

4,764.52

.

200 + 40 + 9 0.010.6 ++ + 0.007

10 + 6 0.3+

4,000 + 700 + 60 + 7 0.020.5 ++

Lets Practice:

249.617

16.3

4,764.52

200 + 40 + 9 0.010.6 ++ + 0.007

10 + 6 0.3+

4,000 + 700 + 60 + 7 0.020.5 ++