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Measuring SI ze

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What is SI?

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**(or International System of Units)**

Systeme Internationale d’Unites (or International System of Units) Abbreviated SI (System of International Measures) It is the internationally accepted standard units of measure. Formerly known as…

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The Metric System

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**The SI Base Units are… What it measures Base Unit Length Meter (m)**

Mass Kilogram (kg) Volume Liter (l or L or ℓ) Time Seconds (s) Temperature Kelvin (K) Amount of a substance Mole (mol) Electric Current Ampere (A) Luminous Intensity Candela (cd)

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**Basic units of the SI system:**

Length = meters (m) Mass = gram (g) Volume = liter (L or l)

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**“I’m ten times better than the way you measure now!”**

The SI System “I’m ten times better than the way you measure now!”

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**Let’s see why… Fill in the blanks (do the math mentally):**

13 miles = ____yards ____feet ____inches 2 1/2 gallons = ____quarts ____pints ____cups ____ounces (22,880 yds) (68,640 ft.) (823,680 in) (10) (20 p) (40 cups) (320 ounces)

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**That was not the SI system!**

What number is the SI system based on? SI 10

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**Let’s see why 10 is an easy base to use.**

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**Multiply each of the following numbers by 10**

15 x 10 = 235 x 10 = 12.4 x 10 = 43.2 x 10 = x 10 =

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**Multiply each of the following numbers by 10**

15 x 10 = 150 235 x 10 = 12.4 x 10 = 43.2 x 10 = x 10 =

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**Multiply each of the following numbers by 10**

15 x 10 = 150 235 x 10 = 2350 12.4 x 10 = 43.2 x 10 = x 10 =

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**Multiply each of the following numbers by 10**

15 x 10 = 150 235 x 10 = 2350 12.4 x 10 = 124 43.2 x 10 = x 10 =

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**Multiply each of the following numbers by 10**

15 x 10 = 150 235 x 10 = 2350 12.4 x 10 = 124 43.2 x 10 = 432 x 10 =

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**Multiply each of the following numbers by 10**

15 x 10 = 150 235 x 10 = 2350 12.4 x 10 = 124 43.2 x 10 = 432 x 10 =

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**Multiply each of the following numbers by 100**

15 x 100 = 235 x 100 = 12.4 x 100 = 43.2 x 100 = x 100 =

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**Multiply each of the following numbers by 100**

15 x 100 = 1500 235 x 100 = 12.4 x 100 = 43.2 x 100 = x 100 =

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**Multiply each of the following numbers by 100**

15 x 100 = 1500 235 x 100 = 23500 12.4 x 100 = 43.2 x 100 = x 100 =

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**Multiply each of the following numbers by 100**

15 x 100 = 1500 235 x 100 = 23500 12.4 x 100 = 1240 43.2 x 100 = x 100 =

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**Multiply each of the following numbers by 100**

15 x 100 = 1500 235 x 100 = 23500 12.4 x 100 = 1240 43.2 x 100 = 4320 x 100 =

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**Multiply each of the following numbers by 100**

15 x 100 = 1500 235 x 100 = 23500 12.4 x 100 = 1240 43.2 x 100 = 4320 x 100 = 85356

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**Divide each of the following numbers by 10**

230 10 = 4500 10 = 123.5 10 = 21.6 10 = 8.465 10 =

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**Divide each of the following numbers by 10**

230 10 = 23 4500 10 = 123.5 10 = 21.6 10 = 8.465 10 =

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**Divide each of the following numbers by 10**

230 10 = 23 4500 10 = 450 123.5 10 = 21.6 10 = 8.465 10 =

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**Divide each of the following numbers by 10**

230 10 = 23 4500 10 = 450 123.5 10 = 12.35 21.6 10 = 8.465 10 =

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**Divide each of the following numbers by 10**

230 10 = 23 4500 10 = 450 123.5 10 = 12.35 21.6 10 = 2.16 8.465 10 =

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**Divide each of the following numbers by 10**

230 10 = 23 4500 10 = 450 123.5 10 = 12.35 21.6 10 = 2.16 8.465 10 = .8465

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**Divide each of the following numbers by 100**

230 100 = 4500 100 = 123.5 100 = 21.6 100 = 8.465 100 =

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**Divide each of the following numbers by 100**

230 100 = 2.30 4500 100 = 123.5 100 = 21.6 100 = 8.465 100 =

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**Divide each of the following numbers by 100**

230 100 = 2.30 4500 100 = 45.00 123.5 100 = 21.6 100 = 8.465 100 =

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**Divide each of the following numbers by 100**

230 100 = 2.30 4500 100 = 45.00 123.5 100 = 1.235 21.6 100 = 8.465 100 =

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**Divide each of the following numbers by 100**

230 100 = 2.30 4500 100 = 45.00 123.5 100 = 1.235 21.6 100 = .216 8.465 100 =

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**Divide each of the following numbers by 100**

230 100 = 2.30 4500 100 = 45.00 123.5 100 = 1.235 21.6 100 = .216 8.465 100 =

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Nice Job! If you can multiply & divide by 10 (or any power of 10), then the metric system will be easy for you.

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** Checkpoint: Metric units are based on multiples of what number?**

Multiply--Move the decimal to the right Divide--Move the decimal to the left

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**Scientists created different sized units of measure by adding prefixes to the base units.**

It’s kind of like using a cup as a basic measure and using 1/2 a cup, 1/4 of a cup, or 1/3 of a cup for the smaller measures.

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**Numerical value in Base units**

Prefix Symbol Numerical value in Base units Power of 10 value Giga G 1,000,000,000 109 Mega M 1,000,000 106 Kilo- k 1000 103 Hecto- h 100 102 Deka- da 10 101 Base Unit -- 1 Deci- D 0.1 10-1 Centi- c 0.01 10-2 Milli- m 0.001 10-3 Nano n 10-9 Pico P 10-12 The SI Prefixes

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What is length? Length is the distance from one point to another

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**The basic unit of length in the SI system is the …**

meter

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Pause… How big do you think a meter is? Find something you think is a meter in length.

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THE METER The meter is the starting point for measuring length in the metric system. START

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Here’s a meter stick!

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**It takes 10 decimeters to make up 1 meter.**

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**It takes 10 centimeters to make up 1 decimeter.**

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**1 decimeter = 10 centimeters, **

If 1 meter = 10 decimeters and 1 decimeter = 10 centimeters, then how many centimeters make up 1 meter?

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**That’s right! 1 meter = 100 centimeters**

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100centimeters = 1 meter

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**It takes 10 millimeters to make up 1 centimeter.**

Boy, that’s small!

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If 1 meter = 10 decimeters and 1 decimeter = 10 centimeters and 1centimeter = 10 millimeters then how many millimeters make up 1 meter?

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**That’s right! 1000 millimeters = 1 meter**

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**It takes 10 millimeters to make up 1 centimeter.**

Millimeters are so small that they almost run together.

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**Checkpoint One centimeter is divided into how many millimeters?**

10 millimeters (mm)

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**Now let’s take a closer look at some measuring devices.**

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**This is a magnified image of a ruler/meter stick.**

1 2 3 4 This is one centimeter.

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**This is a magnified image of a ruler/meter stick.**

1 2 3 4 This is half of a centimeter.

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**This is a magnified image of a ruler/meter stick.**

1 2 3 4 This is one millimeter.

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This key measures 3 cm. 1 2 3 4

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**Or you could say that it measures 30 mm.**

1 2 3 4

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This key measures 2.5 cm. 1 2 3 4

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**Or, you could say that it measures 25 mm.**

1 2 3 4

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1 2 3 4 This toy car measures 4.2 cm.

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1 2 3 4 Or, you could say it measures 42 mm.

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**The metric system deals with powers of 10**

1 meter = 10 decimeters = 100 centimeters = 1000 millimeters

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**How many centimeters make up 2 meters?**

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**That’s right! There are 200 centimeters in 2 meters.**

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**How many millimeters make up 2 meters?**

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**That’s right! There are 2000 millimeters in 2 meters.**

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**How many decimeters make up 2 meters?**

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**That’s right! There are 20 decimeters in 2 meters.**

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The metric system really is 10 times better than our standard system of measurement. It is very easy to convert from one unit to another.

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**You must simply multiply by 10, 100, or 1000**

You must simply multiply by 10, 100, or OR You must simply divide by 10, 100, or 1000.

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The end.

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