Reading and Writing Decimals

1
3
9
9
.
4
Reading Writing Decimals
2
Decimal Place Values
Lets take a look at the places and the values of
decimals.
Tenths
Ones
Tens
Hundredths
Thousandths
.1
1
10
.01
.001
.
Decimal
3
Reading Writing Decimals

1. 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)

4
Example
8,243.67
Eight thousand, two hundred forty-three
and
sixty-seven
hundredths
5
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-four
and
fifty-two hundredths
Sixty-three thousand, nine hundred twenty
and
.
one hundred forty-three hundredths
6
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.

7
Example Write the following number in standard
formtwo hundred six and five thousandths
5
206
.
__ __ __
0 0
The word thousandths indicates that we need
three decimal places.
When we clean it up, the answer is 206.005
8
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
.
061
3,935
9
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.

10
Example Write 13.361 in expanded form.
Remember, deal with the number before the decimal
first.
0.06
0.3



0.001
10 3
Then, do the decimal part.
11
Lets Practice

• 249.617
• 16.3
• 4,764.52

200 40 9
0.01
0.6



0.007
10 6
0.3

4,000 700 60 7
0.02
0.5


.
12
Lets Practice
200 40 9
0.01
0.6



0.007

• 249.617
• 16.3
• 4,764.52

10 6
0.3

4,000 700 60 7
0.02
0.5