Lesson 65 Decimal Parts Of A Meter Math Worksheet - Saxon Math Intermediate 5 Page 2
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6We round the given amounts to the nearest ten dollars
Solve
and perform a “trial solution.” Gina collected about $50. Bryce
collected about $20 less than Gina, so he collected about
$50
$20, or about $30. The total collection was about $120.
We subtract Gina’s and Bryce’s amounts from the total to find the
approximate amount collected by Shelley:
$120
$50
$30
$40
We know that our solution process makes sense if we add the
three approximate amounts for Gina, Bryce, and Shelley:
$50
$30
$40
$120
Now we will use exact numbers in our solution. We can use a
calculator to speed the process. First we calculate the amount
Bryce collected:
$53.38
$22.89
$30.49
Now we subtract the amounts for Gina and Bryce from the total
to find the amount for Shelley:
$123.58
$53.38
$30.49
$39.71
We know that our answers are reasonable because
Check
they are close to the rounded numbers we used when solving a
simpler problem. Also, we find that the two amounts we found
plus the amount we are given total $123.58, which equals the
total given in the problem.
New Concept
New Concept
In this lesson we will use metric units of length to model
Math Language
decimal numbers. The basic unit of length in the metric system
The metric system
is a
meter.
One big step is about a meter long. Many school
of measurement is
classrooms are about 10 meters long and 10 meters wide.
a base-ten system,
and it is similar
to our monetary
Meters may be divided into tenths, hundredths, and thousandths.
system and to our
These smaller units are decimeters, centimeters, and millimeters.
numeration system.
1 meter
10 decimeters
100 centimeters
1000 millimeters
cm 10
20
30
40
50
60
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80
90
Lesson 65
413
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