home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Middle School Math & Grammar
/
ProOneSoftware-MiddleSchoolMath&Grammar-Win31.iso
/
math
/
chapter3.1b
< prev
next >
Wrap
Text File
|
1993-09-24
|
5KB
|
233 lines
231
àï3.1è Introduction to Decimal Numbers.
äè Please write the following Decimal Numbers in words.
â
êêïWrite the Decimal Number, 23.496, in words.
êè Twenty-three and four hundred ninety-six thousandths
éS In the last chapter we looked at operations on the set of
non-negative fractions described in the following list.
#êêêè╚è ╔è ╩è ╦è ╠ï...
êêêè1è 1è 1è 1è 1
#êêêè╚è ╔è ╩è ╦è ╠ï...
êêêè2è 2è 2è 2è 2
#êêêè╚è ╔è ╩è ╦è ╠ï...
êêêè3è 3è 3è 3è 3
êêêê :
êêêê ∙
Each one of ç fractions can be written in decimal form by dividing
the bottom number into the top number generating the following list.
êêêè0.è1.è2.è3.è4.ï...
êêêè0.è.5è1.è1.5ï2.ï...
#êêêêè╪è ╪êè╪
êêêè0.è.33ï.66ï1.è1.33 ...
êêêêï:
êêêêï∙
Each one of ç Decimal Numbers can in turn be written in words.ïIn
order to write the Decimal Number, 23.496, in words, you should complete
the following steps:
1)ïFirst you should write out the Whole Number part.è"twenty-three"
2)ïThen write "and" in place of the decimal point.êè"and"
3)ïWrite the decimal part as though
è it is a Whole Number.êêê"four hundred ninety-six"
4)ïFinally, name the place value of the last digit.ë "thousandths"
Thus, 23.496è=ètwenty-three and four hundred ninty-six thousandths.
1êêèWrite 0.75 in words.
ê A)ïAnd seventy-fiveêë B)ïSeventy-five tenths
ê C)ïSeventy-five hundredthsë D)ïå
ü
êêè 0.75è=èSeventy-five hundredths
Ç C
2êêèWrite 25.4 in words.
A)ïTwenty-five and four tenthsè B)ïTwenty and fifty-four hundredths
C)ïTwo hundred fifty-four thousandthsêêëD)ïå
ü
êêè 25.4è=èTwenty-five and four tenths
Ç A
3êêèWrite 52.137 in words.
êêA)ïFifty-two and one thirty seven
êêB)ïFifty-two and one hundred thirty-seven thousandths
êêC)ïFive and two hundred thirty-seven thousandths
êêD)ïå
ü
ë52.137è=èFifty-two and one hundred thirty-seven thousandths
Ç B
4êêèWrite 30.015 in words.
êêA)ïThirty thousand and fifteen
êêB)ïThirty and fifteen thousandths
êêC)ïThree thousand and fifteen ten-thousandths
êêD)ïå
ü
êêï30.015è=èThirty and fifteen thousandths
Ç B
5êêèWrite 200.0026 in words.
êêA)ïTwo hundred and twenty-six ten-thousandths
êêB)ïTwo hundred and twenty-six thousandths
êêC)ïTwo thousand twenty-six
êêD)ïå
ü
êï200.0026è=èTwo hundred and twenty-six ten-thousandths
Ç A
äè Please write the following numbers in Decimal Form.
â
ëTwo hundred fifty-six and twenty-three thousandthsè=è256.023
éS To write the number, two hundred fifty-six and twenty-three
thousandths, in Decimal Form, you should complete the following steps:
1)ïFirst you should write down the Whole Number part.è "256"
2)ïThen locate the decimal point where "and" occurs.ë"256."
3)ïNext, write the decimal part as though it is a
ëWhole Number.êêêêêë "256.23"
4)ïFinally, insert zeros after the decimal point
ëso that the "3" is in the thousandths place.êè"256.023"
6
êêWrite "thirty-five hundredths" in Decimal Form.
ëA)ï.35êè B)ï.035êèC)ï3500êèD)ïå
ü
êêëthirty-five hundredthsè=è.35
Ç A
7
êêWrite "eighty-five thousandths" in Decimal Form.
ëA)ï85,000ê B)ï.850êèC)ï.085êèD)ïå
ü
êêè eighty-five thousandthsè=è.085
Ç C
8
êëWrite "four and twelve thousandths" in Decimal Form.
ëA)ï4,012êïB)ï4.012êïC)ï4.12êèD)ïå
ü
êêfour and twelve thousandthsè=è4.012
Ç B
9
êWrite "two hundred twenty-six and two hundred six thousandths"
êin Decimal Form.
ëA)ï226.206êïB)ï226,206êC)ï22.606ê D)ïå
ü
ïtwo hundred twenty-six and two hundred six thousandthsè=è226.206
Ç A
10
êêWrite "eighty-three and twenty-four ten-thousandths"
in Decimal Form.
ëA)ï83.24êè B)ï83.024ê C)ï83.0024êD)ïå
ü
êèeighty-three and twenty-four ten-thousandthsè=è83.0024
Ç C
äè Please round each decimal number to the given place
êêïvalue.
â
êêèRoundï246.3874ïto the nearest hundredth.
êè 246.3874 rounded to the nearest hundredth isï246.39
éS To roundï246.3874ïto the nearest hundredth, you must first
locate the hundredths place.
êêêêï246.3874
#êêêêêº
Next, you look at the number one place to the right of theï"8".
êêêêï246.3874
#êêêêêº
Since theï"7"ïis five or larger, theï"8" is rounded up toï"9".
êêêêè246.39
The digits to the right of the hundredths place are dropped.
11
êêRoundï23.462ïto the nearest hundredth.
êA)ï23.47êB)ï23.46êC)ï23.5êD)ïå
ü
êè23.462ïrounded to the nearest hundredth isï23.46
Ç B
12
êêèRoundï5.681ïto the nearest tenth.
êA)ï5.6ê B)ï5.68ê C)ï5.7ê D)ïå
ü
êê 5.681ïrounded to the nearest tenth isï5.7
Ç C
13
êêèRoundï33.6842ïto the nearest thousandth.
êA)ï33.68ë B)ï33.684ë C)ï33.685ë D)ïå
ü
êë33.6842ïrounded to the nearest thousandth is 33.684
Ç B
14
êêèRoundï186.9384ïto the nearest hundredth.
êïA)ï186.94ëB)ï186.938ëC)ï186.93ëD)ïå
ü
êë186.9384 rounded to the nearest hundredth isï186.94
Ç A
15
êêïRoundï237.841ïto the nearest whole number.
êïA)ï237.8êB)ï238êC)ï237êD)ïå
ü
êï237.841ïrounded to the nearest whole number isï238
Ç B