decimals numbers and number sense the buttons on each page will take you forward or backward when...
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DecimalsNumbers and Number
Sense
The buttons on each page will take you forward or backward when you left-click your mouse on them.
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What is a decimal?What is a decimal?
A decimal is a part of a whole.
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One dollar, 4 dimes, and 3 pennies is written in decimal form.
Think about money.
$1.43
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One dollar is equal to 10 dimes.
It takes 10 dimes to make 1 dollar, so a dime is one-tenth of a dollar.
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One dime is equal to 10 pennies.
It takes 100 pennies to make a dollar, so each penny is equal to one-hundredth of a dollar.
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It takes 10 dimes to make 1 dollar, so a dime is one-tenth of a dollar.$0.10 = one dime
It takes 100 pennies to make 1 dollar, so a penny is one-hundredth of a dollar.
$0.01 = one penny
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Practice writing these amounts of money as decimals on a sheet of paper.
71 cents
6 cents
119 cents
215 cents
Click here to check your answers.
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Money is one way we use decimals every day, but decimals are used for more than just money.
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Decimals are special fractions with certain multiples of ten in the denominator.
000,1
1
10
1100
1
000,10
1
= 0.1 = 0.01
= 0.001 = 0.0001
one tenth
one thousandth
one hundredth
one ten-thousandth
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Decimals can also be shown on the place
value chart.
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thou
sand
s
hun
dre
ds
tens
ones
tent
hs
hun
dre
dth
s
thou
sand
ths
ten-
thou
sand
ths
Everything to the left of the decimal point is a WHOLE number.
Everything to the right of the decimal point is PART of a whole.
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thou
sand
s
hund
reds
tens
ones
tent
hs
hund
redth
s
thou
sand
ths
ten-
thou
sand
ths
1 4
This shows 14 (fourteen) spiders.
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thou
sand
s
hund
reds
tens
ones
tent
hs
hund
redth
s
thou
sand
ths
ten-
thou
sand
ths
1 1 5
This shows 115 (one hundred fifteen) candy-corns.
Really! Count them.
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thou
sand
s
hund
reds
tens
ones
tent
hs
hund
redth
s
thou
sand
ths
ten-
thou
sand
ths
0 1 0
Remember the dime? It was less than one whole. It was only a part of 1 whole dollar. 1 dime = $0.10, so we will write it in the tenths and hundredths place value positions.
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thou
sand
s
hund
reds
tens
ones
tent
hs
hund
redth
s
thou
sand
ths
ten-
thou
sand
ths
0 1 0
0 1
$0.10 = 0.1 ten hundredths = one tenth
There are no whole dollars, only part of a whole.
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thou
sand
s
hund
reds
tens
ones
tent
hs
hund
redth
s
thou
sand
ths
ten-
thou
sand
ths
0 0 1
A penny is also only a part of 1 whole dollar. 1 penny = $0.01 since it is one hundredth of a dollar we will write it in the hundredths place value position.
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thou
sand
s
hund
reds
tens
ones
tent
hs
hund
redth
s
thou
sand
ths
ten-
thou
sand
ths
0 2 5
A quarter is also less than 1 whole dollar. 1 quarter = $0.25, so we will write it in the tenths and hundredths place value positions.
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hund
reds
tens
ones
tent
hs
hund
redth
s
thou
sand
ths
ten-
thou
sand
ths
one hundredthirty
3
-four
4
andseven ten-thousandths
0 0 0 71
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Remember, decimals are special fractions with certain multiples of ten in the
denominator.
000,1
1
10
1100
1
000,10
1
= 0.1 = 0.01
= 0.001 = 0.0001
one tenth
one thousandth
one hundredth
one ten-thousandth
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Decimals show parts of wholes in divisions of ten.
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Decimals can show parts of wholes in divisions of hundreds or
thousands.
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Now practice writing and saying some decimals. (Write your answers on paper. Then check your work by clicking below.)
What portion of the square is green?
What portion of the square is yellow?
Click here for the answer.
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0.4 (or four tenths) of the square is green. 0.6 (six tenths) of the square is yellow. (Does this match what you wrote on your paper?)
Click here to hear the answer.
Click here and try another one!
0.4 0.6
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How many hundredths are red?
How many hundredths are yellow?
Click here to find out.
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32 hundredths are red, 0.32
68 hundredths are yellow, 0.68
Click to hear the answer.
Click here and try another one!
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How many thousandths are purple?
How many are blue?
Check your answer here.
Don’t forget to write your answers down!
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872 thousandths are purple. This number is written
0.872
128 thousandths are blue. This number is written
0.128Did you check your work?
More Click this button to hear the numbers.
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How many thousandths are green?
How many thousandths are blue?
Check your answers here.
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44 thousandths
0.044 are green.
956 thousandths
0.956 are blue.
More Click this button to hear the numbers.
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0.4 0.6<
Compare these decimals.
four tenths is LESS THAN six tenths
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four tenths IS EQUAL TO forty hundredths
Compare these decimals.
0.4=0.40
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0.008
eight tenths is greater than eight hundredths
eight hundredths is greater than eight thousandths
0.8 0.08> >
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Compare these decimals using <, >, or =.
A. 0.6 and 0.7
B. 0.39 and 0.3
Check your answers.
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B. 0.39 >
0.3
Click to hear the answers.
A. 0.6 < 0.7
0.6
0.7
0.39
0.3
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Compare these decimals using <, >, or =.
C. 0.54 and 0.56
D. 0.20 and 0.2
Check your answers.
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D. 0.20 = 0.2
Click to hear the answers.
C. 0.54 < 0.56
0.54
0.56
0.20
0.2
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Microsoft Excel Worksheet
Click below to play a very cool decimal game!
When you are finished, close the Excel window by clicking on the x in the top right hand corner.
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Microsoft Excel Worksheet
Click below to play again, this time with hundredths and thousandths.
When you are finished, close the Excel window by clicking on the x in the top right hand corner.
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For more fun with decimals check out these:
Games: Virtual Counting Stick Turtle Races
Web Sites: See Burly Middle School’s Numeracy Activities. It is full of wonderful math games! http://www.numeracyresources.co.uk/ Math Internet Projects
Books: Patriarca, Linda A., Scheffel, Marilyn, and Hedeman, Sheila. Decimals:A Place Value Approach. Dale Seymour Publications
Burns, Marilyn. About Teaching Mathematics A K-8 Resource. Math Solutions Publications
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DecimalsNumbers and Number Sense
Written by Kathy Russo and Roberta Morse
Martin Luther King Jr. Elementary School
SOL Objective 5.1 The student will read, write and identify the place values of decimals through ten-thousandths.
SOL Objective 5.2 The student will compare the value of two decimals through ten-thousandths using the symbols >, <, or =.Credits:Thank you to Mark Cogan at Burley Middle School for permission to link to his website.
This presentation was created using Microsoft PowerPoint 97.
Graphics from Jasc Paint Shop Pro version 6.02.
Decimal Squares were created using Microsoft Excel 97.
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Practice writing these amounts of money as decimals on a sheet of paper.
71 cents $0.71
6 cents $0.06
119 cents $1.19
215 cents $2.15