Metric System

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Metric System - Revisited
Measuring – 3 things we measure
Length
Mass
Volume
Two Methods
English
Metric
What you are used to.
Inches, feet,
& miles
Pounds &
Ounces
Quarts, pints,
& gallons
Length
English
Mass
Volume
What scientists use…and the rest of
the world except Liberia and Burma.
meters
Length
Mass
grams
Metric
Volume
liters
Now forget the left side of the bubble
map… This is what you are to use from
now on
Metric System
Length
Mass
Volume
Meters (m)
Grams (g)
Liters (L)
These are the Suffixes….
Metric System
Length
Mass
Volume
Meters (m)
Grams (g)
Liters (L)
Suffixes (root word) cont…
• The word prehistoric –
“historic” is the suffix
• It always comes after
the prefix.
• Same with multivitamin
– “vitamin” is the suffix
Prefixes
• They come before the
suffix.
• Prefixes by themselves
don’t mean anything.
• Example, the prefix
“Un” means nothing
• Added to unhappy
means not happy.
Metric Prefixes
•
•
•
•
•
•
Kilo (k) – largest
Hecto (h)
Deca (da)
Deci (d)
Centi (c)
Milli (m) – smallest
• They will never be by
themselves, they have to
be written with a suffix.
Prefixes + Suffixes for Mass (grams)
• Prefix + Suffix = Term
•
•
•
•
•
•
• These terms only measure
mass.
Kilo (k) + gram (g)= Kilogram (kg)
Hecto (h) + gram(g) = Hectogram (hg)
Deca (da) + gram(g) = Decagram (dag)
Deci (d) + gram(g) = Decigram (dg)
Centi (c) + gram(g)= Centigram (cg)
Milli (m) + gram(g)= milligram (mg)
Prefixes + Suffixes for Volume(Liters)
• Prefix + Suffix = Term
•
•
•
•
•
•
Kilo (k) + Liter (L) = Kiloliter (kL)
Hecto (h) + Liter(L) = Hectoliter (hL)
Deca (da) + Liter (L) = Decaliter (daL)
Deci (d) + Liter (L) = Deciliter (dL)
Centi (c) + Liter (L) = Centiliter (cL)
Milli (m) + Liter (L) = milliliter (mL)
• These terms only
measure volume.
Prefixes + Suffixes for length(meters)
• Prefix + Suffix = Term
•
•
•
•
•
•
Kilo (k) + meter(m) = Kilometer (km)
Hecto (h) + meter(m) = Hectometer (hm)
Deca (da) + meter (m) = Decameter (dam)
Deci (d) + meter (m) = Decimeter (dm)
Centi (c) + meter (m) = Centimeter (cm)
Milli (m) + meter (m) = millimeter (mm)
• These terms only
measure meters.
Why do we have specific prefixes for
each type of measurement… Length
A big
measurement
Km
hm/ dam
dm/ cm
A small
one
mm
Same scenario works for volume and
mass
• Volume – what units
(prefix + suffix) would
you use to measure the
volume of this?_______
• Mass - what units
(prefix + suffix) would
you use to measure the
mass of this?_________
How to measure volume
• You measure the
meniscus
• Meniscus is the bottom
of the dip of water.
Determining what each line may
represent on a measuring tool.
•
Step 1 – find any two numbers… example 50 and
40
•
Step 2 – subtract the two… 50 – 40 = 10
•
Step 3 – count the lines in between them… start at
the line above the bottom number, and stop at the
line that is the top number. Example… from 40 to
50 I count 10 lines.
•
Step 4 – divide the answer from step 2 by the
answer from step 3…. 10 divided by 10 = 1
•
Your answer from step four tells you that each line
equals 1.
•
This example the meniscus would read 43mL
How to measure length
10mm = 1cm
10cm = 1dm
10dm = 1m
10m = 1dam
10dam = 1hm
10hm = 1km
1cm
1mm
How to measure mass
• Always measure in
grams
• As shown the balance is
373.3g
• 300 + 70 + 3.3 = 373.3g
Metrics - Temperature
• Celsius– standard form
of temperature
measurement
– Abbreviation
• C (Capitol)
– Human body is
98.6 F, and
that is 37 C
Great… How do I do conversions?
Meter
(m), Liter
(L), Gram
(g)
Deci- Centi- Milli(d)
(c)
(m)
10
units
1 unit
.1
units
.01
units
0.56
5.6
56
560
5600 56000
/100
/10
1
X10
X100
Kilo(k)
Hecta- Deca(h)
(da)
1000
units
100
units
0.056
/1000
.001
units
X
1000
To remember
•
•
•
•
•
•
•
Kids
Have
Damaged
3
Different
Colorful
Millipedes
Great… How do I do conversions?
Example #1:
0.250kg
mg
Kilo(k)
Hecta- Deca(h)
(da)
0.250
0.250
Gram (g)
Deci- Centi- Milli(d)
(c)
(m)
The decimal is moving
1x
2x
3x
4x
5x
6x
2.5
25.
250.
2500.
25,000.
250,000.
250,000.
mg
How do I do conversions?....cont
Example #1:
12mL
L
Note: If you have a whole number, the decimal is always at the end of the very right number.
Example 12.0
Kilo(k)
Hecta- Deca(h)
(da)
Liter(L)
Deci- Centi- Milli(d)
(c)
(m)
The Decimal is moving
12.0
3x
2x
1x
0.012
0.12
1.2
0.012L
12.0
.

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