Scientific Measurements

The metric system

Metric Prefixes

Kilo = 1000

Hecto = 100

Deka = 10

Deci = 1/10

Centi = 1/100

Milli = 1/1000

Meters, Liters, Grams• Meters measure length• Liters measure volume• Grams measure mass

How Big?

A meter is about 39 inches A kilometer is 0.6 mile A centimeter is about the width of

your little finger A gram is about the mass of a paper

clip A kilogram is 2.2 pounds You drink 2 liters of pop

Other metric units

• Temperature is measured in degrees celsius or centigrade

• Heat is measured in calories or joules

• Weight is measured in newtons

• Mega = 1,ooo,ooo

• Micro = one millionth

• Nano = one billionth

K H D O D C M

Changing from one metric unit to another is called metric conversion

“O” is the space where meter, liter, or gram belongs

Kids Have Dropped Over Dead Converting Metrics

Let’s practice!

K H D O D C M

To change from one metric unit to another, we simply move the decimal point.

For example: 25.4 km = _____________ cm?

K-H-D-O-D-C is 5 places to the right 25.4 km = 2,540,000 cm

K H D O D C M

30 cm = ___________hm C – D- O –D- H is 4 places to the left 30 cm = 0.0030 hm

(this is the same as 0.003 hm) 14 dal = _____dl D- O –D is 2 places to the right 14 dal = 1400 dl

Scientific notation

Rules:1 digit before the decimal pointMultiply the number by a power of 10

Example: Write 34,000 in scientific notation.

Solution: 3.4 x 104

Write the following in scientific notation:

4,100,000 = _______________ 345,600,000,000 =

_________ 0.0456= ________________ 0.00000012=____________ O.00305= ____________

4.1 x 106

3.456 x 1011

4.56 x 10-2

1.2 x 10-7

3.05 x 10-3

Write the following in standard form:

4.67 x 103 =__________________ 3.112 x 105 = _________________ 3.112 x 10-4 = ________________ 4 x 10-6 = ___________________ 1 x 1011 = __________________

46703112000.0003112

0.000004100,000,000,000

That’s all folks!That’s all folks!

Time to try some on your worksheets!Time to try some on your worksheets!