Transcript MJ2 - Davidsen Middle School

MJ2
Ch 1.9 – Scientific Notation &
Quiz #2
Bellwork
•
Please take out your assignment from
yesterday and leave it on your desk for
me to check.
• Convert the measurements:
1. 650 cm = _______m
2. 52L = _______kL
3. 2,500 mg = _______g
Assignment Review
• Workbook p. 37
Objective
1. Students will demonstrate
understanding of converting metric
measurement
2. Students will write numbers in
scientific and standard form
Quiz
• Please take out a sheet of paper, pencil, and
your calculator and text book…then clear
your desk
• In the upper right hand corner of your paper
write your name, today's date/period & Quiz
#2 (No heading & No pencil will result in a 1
letter grade deduction EACH for this quiz)
• Today you will have a quiz on converting
metric measurement.
Quiz
• 5 questions = 20 points each
• You may use the FCAT conversion chart at
the back of your text book
• Number each problem
• You do not have to write the question
• Circle your answer
• Show all work (No work = No credit)
Quiz
1.
2.
3.
4.
5.
Each morning Carlos runs 1.5 kilometers. How many
meters did he run?
A soda can contains 355 milliliters of liquid. How
many liters of liquid does it contain?
For 11 – 14 year olds, the recommended Dietary
Allowance (RDA) for protein is about 60 grams. How
many milligrams do they need daily?
A helicopter was flying 800 meters above the ground.
How many kilometers above the ground was it flying?
A water sprinkler sprays about 150 liters of water
each hour. How many kiloliters of water does it
spray?
Quiz Answers
1.
2.
3.
4.
5.
1,500 m
0.355 L
60,000 mg
0.8 km
0.15 kL
After the Quiz…
• Please pass your answer sheets forward…
• Then take out your notebook and get ready to
work…
• Today we will look at numbers in scientific
notation and standard form…
• Raise your hand if you can explain why we
need to know how to do this….
Objective
• Students will express numbers in
scientific notation
CONVERTING FROM
SCIENTIFIC NOTATION
TO STANDARD FORM
Positive Exponents
• Positive Exponent – If the scientific notation
has a positive exponent move the decimal the #
of spaces of the exponent to the RIGHT
• Example: 5.34 x 104
5.3400 = 53,400
Starting at
the
decimal
point move
it 4 spaces
to the
RIGHT
Negative Exponents
• Negative Exponent – If the scientific notation
has a negative exponent, move the decimal
the # of spaces of the exponent to the LEFT
• Example: 3.27 x 10-3
003.27 = .00327
Starting at
the
decimal
point move
it 4 spaces
to the
LEFT
Your Turn
•
1.
2.
3.
4.
In the notes section of your notebook
write and complete the following
problems.
6.7 x 103
8.325 x 108
7.218 x 10 -6
2.700 x 10 -4
CONVERTING FROM
STANDARD FORM TO
SCIENTIFIC NOTATION
Scientific Notation
• A number is expressed in scientific
notation when it is written as the product
of a factor and a power of 10. The factor
must be greater than or equal to 1 and
less then 10
• Lets look at an examples with positive
and negative exponents…
Positive Exponent
3,725,000
1. Place a decimal point between 3 & 7
2. Count the number digits from the decimal to
the end of the number going right
3. Drop all zeros in the number and write as
a power of 10
3,725,000 = 3.725 x 106
Negative Exponent
0.000316
1. If the standard form number is less than 1 you
will have a negative exponent.
2. Place the decimal between the 3 & 1
3. Count the number of digits from the original
decimal to the new decimal place
4. Restate the number as a power of 10
0.000316 = 3.16 x 10-4
Your Turn
•
1.
2.
3.
4.
In the notes section of your notebook
write and covert the following to
scientific notation
43,000
52,300,000
0.00072
0.0000901
Summary
• In the notes section of your notebook
summarize key concepts covered in
today’s lesson
• Today we discussed:
• Converting from scientific notation to
standard form
• Converting from standard form to scientific
notation
Assignment
• Text p. 45 # 10 – 36
Reminder
• I do not accept answers only!
• You must write the problem & answer
• Check the answers to the odd problems
with the answers in the back of the text
book.