1. Measurements
Measurement is finding a number that shows the size or amount of something. We can measure many different things, but mostly we measure length, volume, mass, time and temperature.

2. Common Metric Prefixes
Symbol
Factor Number
Factor Word
Kilo k
1,000
Thousand
Hecto h
100
Hundred
Deca da 10
Ten
Deci d
0.1
Tenth
Centi c
0.01
Hundredth
Milli m
0.001
Thousandth

3. Length Length is measured in : Millimeters Centimeters Meters
Kilometers
1 centimeter = 10 millimeters
1 meter = 100 centimeters
1 kilometer = 1000 meters

4. In the United States (US) the length is measured in:
Inches
Feet
Yards
Miles
1 inch= 2.54 cm
1 foot = 12 inches
1 yard = 3 feet = 36 inches
1 mile = 1,760 yards = 5,280 feet = 63,360 inches
1 mile = km

5. Volume To measure the volume of liquids we use:
A kiloliter is 1000 liters
A hectoliter is 100 liters
A decaliter is 10 liters
A liter is the basic unit of volume
A deciliter is 1/10 liter
A centiliter is 1/100 liter
A milliliter is 1/1000 liter

6. Mass To measure mass we use grams (g). A tonne is 1000 kilograms
A kilogram is 1000 grams
A hectogram is 100 grams
A decagram is 10 grams
A gram is the stem unit of mass
A decigram is 1/10 gram
A centigram is 1/100 gram
A milligram is 1/1000 gram

7. Temperature There are 2 well known scales to measure temperature:
Celsius
Fahrenheit
To convert Celsius to Fahrenheit we can use a formula:
(𝑥 𝐶 0 * 9 5 ) + 32 = y F⁰
𝑥+𝑎 𝑛 = 𝑘=0 𝑛 𝑛 𝑘 𝑥 𝑘 𝑎 𝑛−𝑘

8. Time Time is measured in: Seconds Minutes ( 1 min = 60 sec)
Hours (1 h = 60 min)
Days ( 1 day = 24 hours)
Weeks ( 1 week = 7 days)
Fortnight (1 fortnight = 2 weeks)
Months ( 1 month = 28, 29, 30, 31 days)
Years ( 1 year = 365 or 366 days)
Decade ( 1 decade = 10 years)
Century ( 1 century = 100 years)
Millennium (1 millennium = 1000 years)