Lesson 3.1 Decimals And Place Value Worksheet Page 2
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A
decimal
is a number that is written using the base-ten place-value
system. Each place value is ten times the place value to its right.
Decimals and Place Value
Word form
three and twelve hundredths
Decimal form
3.12
3.1 2
Expanded form
decimal point
3 ones
1 tenth
2 hundredths
(read as and)
3.0
0.1
0.02
2
Writing Decimals
E X A M P L E
Swimming
A timer at your swim meet says your time was twenty-eight
and six tenths seconds. Write your time as a decimal.
twenty-eight
and
six tenths
The word
and
indicates
the decimal point.
28
.
6
seconds
3
Reading Decimals
E X A M P L E
Helio Castroneves won the 2001 Indianapolis 500. His best
Auto Racing
lap time was 41.0238 seconds. Write his time in words.
You read a decimal according
41.0238
to the last place value.
forty-one
and
two hundred thirty-eight ten-thousandths
seconds
Y
our turn now
3. Write twenty-five and seven hundred-thousandths as a decimal.
4. Write 5.029 in words.
5. Write 706.25 in words.
108
Chapter 3
Decimal Addition and Subtraction
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