Metric System - Revisited

Measuring – 3 things we measure

Mass

Length

Volume

Two Methods

English Metric

What you are used to.

Length

Mass

Volume

English

Inches, feet,& miles

Pounds &Ounces

Quarts, pints, & gallons

What scientists use…and the rest of the world except Liberia and Burma.

Length

Mass

Volume

Metric

meters

grams

liters

Now forget the left side of the bubble map… This is what you are to use from now on

Metric System

Mass

Liters (L)Meters (m) Grams (g)

Length Volume

These are the Suffixes….

Metric System

Mass

Liters (L)Meters (m) Grams (g)

Length Volume

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

• 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)

• These terms only measure mass.

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

Km

hm/ dam

mm

dm/ cm

A big measurement

A small one

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

1mm1cm

10mm = 1cm10cm = 1dm10dm = 1m10m = 1dam10dam = 1hm10hm = 1km

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?Kilo-(k)

Hecta-(h)

Deca-(da)

Meter (m), Liter (L), Gram

(g)

Deci-(d)

Centi-(c)

Milli-(m)

1000 units

100 units

10 units

1 unit .1 units

.01 units

.001 units

0.056 0.56 5.6 56 560 5600 56000

/1000 /100 /10 1 X10 X100 X1000

To remember

• Kids• Have• Damaged• 3• Different• Colorful• Millipedes

Great… How do I do conversions?Example #1: 0.250kg mg

Kilo-(k)

Hecta-(h)

Deca-(da)

Gram (g) Deci-(d)

Centi-(c)

Milli-(m)

0.250

1x 2x 3x 4x 5x 6x

0.250 2.5 25. 250. 2500. 25,000. 250,000.

250,000.mg

The decimal is moving

How do I do conversions?....contExample #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-(h)

Deca-(da)

Liter(L) Deci-(d)

Centi-(c)

Milli-(m)

3x 2x 1x 12.0

0.012 0.12 1.2 12.0

0.012L .

The Decimal is moving