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Lesson 4 ltla Guided Practice
Comparing and Rounding Decimals
Study the example below. Then solve problems 18-20.
Example
Makayla's mass at birth was 3.747 kilograms. Her brother
John's
mass at birth was 3.477 kilograms. Whose mass at birth rounded
to
the nearest whole kilogram was 4 kilograms?
Look at how you could show your work using a number line.
3 3.1 3.2 3.3
3.477 I • I
3.4 3.5
3.747 I I • I
3.6 3.7 3.8 3.9 I .., 4
The point re present ing Makayla's mass at birth is close r to 4
kilograms
than to 3 kilograms. The po int represe ntingJohn's mass at
birth is
closer to 3 kilograms than to 4.
Solution Makayla's mass at birth rounds to 4 kilograms.
Ul] A grocery store charges to th' nearest hundredt6}f a pound
for produce. If Landon purchased 2.386 pounds of tomatoes, what
weight did the store charge for? °.)~ Z, r:,K r: \e \,, '('
Show your work. >":'/J ,)-:t:{ \' \ \ ~ ~ e./ \ \e; '\ \ \
r,J'
~ (} '"'\~ ,\...
2, 39 o~ be.Ill f)d be.c.o111es
Solution J. 3 L\ o,----
Rounding decimals is like rounding whole numbers.
• Pair/Share
How do the masses at birth compare?
l How do I use place value to round whole
numbers and decimals?
Pair/Share About how many whole pounds of tomatoes did Landon
purchase? About how many tenths of a pound did he purchase?
30 L•sson 4 Compare and Round Decimals 0Curriculum Associates,
LLC Copying is not permitted.
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IE Ellie fills her car with 14.297 gallons of gas. Alivia fills
her car with 14.209 gallons of gas. Write an Inequality statement
comparing the
two gas purchases.
Show your work. ,lr.zc=n> /l-f.2..09 or
I 4. 20q < I t-f. 2 q 7
Solution------------------
Em Which of the following comparisons is NOT true? Circle the
letter of the correct answer.
A 42.300 = 42.3
B 5.020 < 5.20
c~ D 108.308 > 108.4
~~~chose A, a~ the correct answer. How did she get that
answer>
ue.. J I Q L IJ () 1 I,'\~ J('/ ,1.) _ , _.:,_
0Curriculum A ,
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ssocrates LLC C . ' opymg is not permitted. Lesson4 Co
How do I use place value to compare numbers?
Pair/Share How could you use rounding to compare
the numbers?
Do I compare the number of digits or compare the place value
of the digits?
Pair/Share Does Ava's answer make sense?
m pare and Round Decimals 31
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Lesson 4 • Independent Practice
Comparing and Rounding Decimals
Solve the problems.
0 The weights of four similar packs of tomatoes are listed
below. Pack A: 2.4~ounds ::::. 2 , L-f (o Pack B: 2.4~ pounds -:a-
d y Lo '\ Pack C: 2.4~ pounds ::::. 7- ~ \...\ 5 ( L\, 01 less l.Q,
\- ' \- vesfJ Pack D: 2.4~ ounds ~ 2.. . l--\ (o __ -.,-----,
Malcolm rounds the weights to th nearest hundredth pound. Which
weight does not round to 2.46 pounds?
A 2.456 pounds
B 2.457 pounds
6 2.454pou~ D 2.459 pounds
EJ Which comparison is not true?
1 .. 7i L.. 1.92
D Tori and Alvin use a stopwatch to record the amount of time it
takes a marble to roll down aJour:_story ramp. Tori's marble ta~,
while Alvin's marble tal
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Q Lau · · s ~en is go~ng to have soup for dinner, but she
doesn't want more than 0.92 gram of odium. Which brand of soup
listed below has greater than 0.92 gram of sodium? .'""') . ) ')
Brand A:____0.9~0 gram Brand B: 0.875 gram Brand C: 0.915 gram '
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Answer ~ - -
Brand O": 11100 gram J 2\ \ ~ \ \..' I
, I - \ i◊ _; ) 0 The weights of four packages of meat are shown
below.
Package A - l .748 pounds -Package B l .645 pounds
Package C 1.754 pounds -Package D 1.532 pounds Each package is
priced by how much it weighs to the 'nearest tenth of a pound.
Order the packages from greatest to least weight. .. Show your
work. r:l)· v:::--[i ' - . " • • -
\ - -{
Answer C - \. 1i$' ) \4 - \ :-I J b- \ ' Cr, l D - \ ' 5 ( ;,,,_
:;:::-\ ...[il\ ® \,7~~ ~_) \ .7~\U How would the order change if
you rounded the weights to the \ , 7 ,~ \ , 7 5 :;,::: :::;:;;~~L.
L" ~ \' -~~§) 1}5) \\,. ~ ~ \ -\- w ) ) \ . , ,~", "\_- ,~ (A 1_
--\ -.J -1
V
.,./ Self Check Go back and see what you can check off on the
Self Check on page 1 . « urriculum Associates, LLC Copying Is not
permitted. Lesson 4 Compare and Round Decimals 33
