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Round 843 to the nearest ten.

Solution

Locate the tens place. The number 843 with the label “tens place” pointed at the 4 in 843.
Underline the digit to the right of the tens place. The number 843 with the 3 underlined.
Since 3 is less than 5, do not change the digit in the tens place. The number 843 with the 3 underlined.
Replace all digits to the right of the tens place with zeros. The number 840 with the 0 underlined.
Rounding 843 to the nearest ten gives 840.
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Round to the nearest ten: 157 .

160

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Round to the nearest ten: 884 .

880

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Round each number to the nearest hundred:

  1. 23,658
  2. 3,978

Solution

Locate the hundreds place. ..
The digit of the right of the hundreds place is 5. Underline the digit to the right of the hundreds place. ..
Since 5 is greater than or equal to 5, round up by adding 1 to the digit in the hundreds place. Then replace all digits to the right of the hundreds place with zeros. ..
So 23,658 rounded to the nearest hundred is 23,700.
Locate the hundreds place. ..
Underline the digit to the right of the hundreds place. ..
The digit to the right of the hundreds place is 7. Since 7 is greater than or equal to 5, round up by added 1 to the 9. Then place all digits to the right of the hundreds place with zeros. ..
So 3,978 rounded to the nearest hundred is 4,000.
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Round to the nearest hundred: 17,852 .

17,900

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Round to the nearest hundred: 4,951 .

5,000

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Round each number to the nearest thousand:

  1. 147,032
  2. 29,504

Solution

Locate the thousands place. Underline the digit to the right of the thousands place. ..
The digit to the right of the thousands place is 0. Since 0 is less than 5, we do not change the digit in the thousands place. ..
We then replace all digits to the right of the thousands pace with zeros. ..
So 147,032 rounded to the nearest thousand is 147,000.
Locate the thousands place. ..
Underline the digit to the right of the thousands place. ..
The digit to the right of the thousands place is 5. Since 5 is greater than or equal to 5, round up by adding 1 to the 9. Then replace all digits to the right of the thousands place with zeros. ..
So 29,504 rounded to the nearest thousand is 30,000.

Notice that in part , when we add 1 thousand to the 9 thousands, the total is 10 thousands. We regroup this as 1 ten thousand and 0 thousands. We add the 1 ten thousand to the 3 ten thousands and put a 0 in the thousands place.

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Round to the nearest thousand: 63,921 .

64,000

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Round to the nearest thousand: 156,437 .

156,000

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Key concepts

A chart titled 'Place Value' with fifteen columns and 4 rows, with the columns broken down into five groups of three. The header row shows Trillions, Billions, Millions, Thousands, and Ones. The next row has the values 'Hundred trillions', 'Ten trillions', 'trillions', 'hundred billions', 'ten billions', 'billions', 'hundred millions', 'ten millions', 'millions', 'hundred thousands', 'ten thousands', 'thousands', 'hundreds', 'tens', and 'ones'. The first 8 values in the next row are blank. Starting with the ninth column, the values are '5', '2', '7', '8', '1', '9', and '4'.
  • Name a whole number in words.
    1. Starting at the digit on the left, name the number in each period, followed by the period name. Do not include the period name for the ones.
    2. Use commas in the number to separate the periods.
  • Use place value to write a whole number.
    1. Identify the words that indicate periods. (Remember the ones period is never named.)
    2. Draw three blanks to indicate the number of places needed in each period.
    3. Name the number in each period and place the digits in the correct place value position.
  • Round a whole number to a specific place value.
    1. Locate the given place value. All digits to the left of that place value do not change.
    2. Underline the digit to the right of the given place value.
    3. Determine if this digit is greater than or equal to 5. If yes—add 1 to the digit in the given place value. If no—do not change the digit in the given place value.
    4. Replace all digits to the right of the given place value with zeros.

Questions & Answers

what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
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What is meant by 'nano scale'?
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scanning tunneling microscope
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how nano science is used for hydrophobicity
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Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
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what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
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what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
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what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
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Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
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Abigail
for teaching engĺish at school how nano technology help us
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Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
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how can I make nanorobot?
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what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
how did you get the value of 2000N.What calculations are needed to arrive at it
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Practice Key Terms 7

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Source:  OpenStax, Prealgebra. OpenStax CNX. Jul 15, 2016 Download for free at http://legacy.cnx.org/content/col11756/1.9
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