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THE METRIC SYSTEM WHY DO WE USE THE METRIC SYSTEM? Almost all other countries are using the metric system Other countries’ companies are refusing to buy products from the U.S. if not labeled in metric units Scientists need a universal way to communicate data (SI Units) (SI = Système International d'Unités)
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DO NOW 8/21/14 • On your DO NOW sheet, answer the following two
questions:• 1. In your own words describe the “scientific method” • 2. Write down an example of the scientific method in
your everyday life • (If you have questions – check yesterdays notes --
after that, raise your hand!)• WRITE THIS DOWN! Homework – – Finish data packet
Recording Data• Objective: SW demonstrate the computation and
estimation skills necessary for analyzing data and developing reasonable scientific explanations.
• Agenda:– First Five & Do Now– Metric Conversions & Practice– Scientific Notation & Practice– Final 5
• XT • Begin Homework!
THE METRIC SYSTEM
WHY DO WE USE THE METRIC SYSTEM?•Almost all other countries are using the metric system•Other countries’ companies are refusing to buy products from the U.S. if not labeled in metric units•Scientists need a universal way to communicate data (SI Units)•(SI = Système International d'Unités)
APPROXIMATE CONVERSIONS BETWEEN METRIC & US LENGTH
UNITS• A meter is about the same length as a yard• A meter is about three feet long• A decimeter is about four inches long• An inch is about 25 millimeters• A foot contains about 30 centimeters• A foot contains about 3 decimeters
WHAT DOES THE METRIC SYSTEM MEASURE?
• The gram measures mass or how much something weighs
• The liter measures volume which is used when measuring liquids
• The meter measures the length of an object or the distance from place to place
CONVERSIONS
K H D B D C MI E E A E E I
L C K S C N L O T A E I T L O I I
Abbreviations
• Kilo: k (1000 units) ex. km• Hecta: h (100 units) ex. hl• Deca: da (10 units) ex. dag• Deci: d (.10 units) ex. dm • Centi: c (.01 units) ex. cg• Mili: m (.001 units) ex. ml
• Step 1: Determine if you are going to go up or down the ladder.
• Step 2: Determine how many steps there are from one unit to another.
• Step 3: Move the decimal point the amount of places that was determined in steps 1 & 2.
GUIDED PRACTICE PROBLEMS• 160 cm = _________mm
• Step 1: Determine if you are going to go up or down the ladder.
• Step 2: Determine how many steps there are from centimeters to millimeters.
• Step 3: Move the decimal point the amount of places that was determined in steps 1 & 2.
GUIDED PRACTICE PROBLEMS• 160 cm = 1600 mm
GUIDED PRACTICE PROBLEMS
• 1,000 mg = _________g
• Step 1: Determine if you are going to go up or down the ladder.
• Step 2: Determine how many steps there are from milligrams to grams.
• Step 3: Move the decimal point the amount of places that was determined in steps 1 & 2.
GUIDED PRACTICE PROBLEMS
• 1,000 mg = 1 g
GUIDED PRACTICE PROBLEMS
• 250 m = __________km• Step 1: Determine if you are going to go up or
down the ladder.• Step 2: Determine how many steps there are
from meters to kilometers.• Step 3: Move the decimal point the amount
of places that was determined in steps 1 & 2.
GUIDED PRACTICE PROBLEMS
• 250 m = .25 km
ROUNDING
• IF the number you are rounding is followed by 1, 2, 3, or 4 the number stays the same
• IF the number you are rounding is followed by 5, 6, 7, 8, or 9 round the number UP
ROUNDING PRACTICE PROBLEMS(round to the 100ths place)
• 1.777777
• .004
• 5.689
ROUNDING PRACTICE PROBLEMS(round to the 100ths place)
• 1.777777 1.78
• .004 .00
• 5.689 5.69
YOUR TURN!
• USING YOUR NOTES - Complete the conversion challenge worksheet SILENTLY AND INDEPENDENTLY.
• Raise your hand if you have a question!
WELCOME TOSCIENTIFIC NOTATION!
How many miles long is our universe?
How wide is our universe?210,000,000,000,000,000,000,000 miles
(22 zeros)When numbers get this large, it is easier
to write them in scientific notation.
Scientific NotationThe number is written in two parts:
Just the digits (with the decimal point placed after the first digit), followed by× 10 to a power that puts the decimal
point where it should be (i.e. it shows how many places to move
the decimal point).
Write the width of the universe in scientific notation.
210,000,000,000,000,000,000,000 milesWhere is the decimal point now?
After the last zero.Where would you put the decimal to make
this number be between 1 and 10?Between the 2 and the 1
2.10,000,000,000,000,000,000,000.
How many decimal places did you move the decimal?
23When the original number is more than 1,
the exponent is positive.The answer in scientific notation is
2.1 x 1023
1) Express 0.0000000902 in scientific notation.
Where would the decimal go to make the number be between 1 and 10?
9.02The decimal was moved how many places?
8When the original number is less than 1, the
exponent is negative.9.02 x 10-8
1. Convert from real to scientific: 28750.9
2. Convert from scientific to real:4.58 x 106
1. Convert from real to scientific: 28750.9 2.87509 x 10 4
2. Convert from scientific to real:4.58 x 106 4,580,000
Your Turn!
• Silently and Independently• Raise your hand if you have any questions!
XT
• Convert the following units:• 250 mg = _______g• 476 L = _____ml• 20 m = ______cm• Write the following in scientific notation.• 873,000• 270.056
