Transcript Reading and Writing Decimals

Reading & Writing
Decimals
Decimal Place Values
Lets take a look at the places and the values of decimals.
Tens
Ones
10
1
Tenths
.
Decimal
.1
Hundredths Thousandths
.01
.001
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)
Example
8,243.67
Eight thousand, two hundred forty-three
“and”sixty-seven hundredths
Lets Practice:
 247.017
two hundred forty-seven and seventeen thousandths
 16.3
sixteen and three tenths
 4,764.52
Four thousand, seven hundred sixty-four and fifty-two hundredths
63,920.143
Sixty-three thousand, nine hundred twenty and
.
one 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
5
206 . __
0 __
0 __
The word “thousandths” indicates that we need three decimal places.
When we clean it up, the answer is 206.005
Lets Practice:
 Six hundred fifty-three and twenty-three
hundredths
653.23
Fourteen and five tenths
14.5
Three thousand, nine hundred thirty-five and
sixty-one thousandths
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 + 3 + 0.3 + 0.06 + 0.001
Then, do the decimal part.
Lets Practice:
 249.617
200 + 40 + 9 + 0.6 + 0.01 + 0.007
 16.3
10 + 6 + 0.3
 4,764.52
4,000 + 700 + 60 + 7 + 0.5 + 0.02
.
Lets Practice:
200 + 40 + 9 + 0.6 + 0.01 + 0.007
249.617
10 + 6 + 0.3
16.3
4,000 + 700 + 60 + 7 + 0.5 + 0.02
4,764.52