Warm Up

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Warm Up
Lesson Presentation
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Warm Up Divide. 1. 2.
3. Write each
decimal as a fraction in simplest form. 4. 1.15
5. 0.22
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Learn to add and subtract decimals and rational
numbers with like denominators.
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(No Transcript)
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The 100-meter dash is measured in thousandths of
a second, so runners must react quickly to the
starter pistol.
If you subtract a runners
reaction time from the total race time, you can
find the amount of time the runner took to run
the actual 100-meter distance.
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In August 2001 at the World University Games in
Beijing, China, Jimyria Hicks ran the 200-meter
dash in 24.08 seconds. Her best time at the U.S.
Senior National Meet in June of the same year was
23.35 seconds. How much faster did she run in
June?
24.08 23.35
She ran 0.73 second faster in June.
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Tom ran the 100-meter dash in 11.5 seconds last
year. This year he improved his time by 0.568
seconds. How fast did Tom run the 100-meter dash
this year?
11.5 0.568
Tom ran the 100-meter dash in 10.932 seconds this
year.
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Find the sum
0.3 (1.2)
0.9
1.5 (1.8)
0.3
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To add or subtract rational numbers with the same
denominator, add or subtract the numerators and
keep the denominator.
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Find the sum, show your work.
1 5
2 5

3 8
1 8

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Add or subtract, show your work
3 7
6 7

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Evaluate the expression for the given value of
the variable.
12.1 x for x 0.1
12.1 (0.1)
12.2
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Evaluate the expression for the given value of
the variable.
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Evaluate the expression for the given value of
the variable.
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Lesson Quiz Part 1
Simplify.
2. 2.5 (2.8)
1. 1.2 8.4
7.2
0.3
3 4

5 4
3.


Evaluate.
4. 62.1 x for x 127.0
64.9
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Lesson Quiz Part 2
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Sarahs best broad jump is 1.6 meters, and Jills
best is 1.47 meters. How much farther can Sarah
jump than Jill?
0.13 m
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Homework

• Pg 119
• 1 41 odd
• 49 54 all