Measurement and Units
Master standard and metric measurement systems for the ParaPro test
What You'll Learn
Standard (Customary) Units
US measurement system
Length Measurements
Basic Units
- • 12 inches = 1 foot
- • 3 feet = 1 yard
- • 5,280 feet = 1 mile
- • 1,760 yards = 1 mile
Abbreviations
- • inch = in or "
- • foot = ft or '
- • yard = yd
- • mile = mi
Conversion Example
Convert 7 feet to inches:
7 feet × 12 inches/foot = 84 inches
Weight Measurements
Standard Weight Units
- • 16 ounces = 1 pound
- • 2,000 pounds = 1 ton
Abbreviations: ounce = oz, pound = lb, ton = T
Conversion Example
Convert 3.5 pounds to ounces:
3.5 pounds × 16 ounces/pound = 56 ounces
Capacity (Volume) Measurements
Liquid Measures
- • 8 fluid ounces = 1 cup
- • 2 cups = 1 pint
- • 2 pints = 1 quart
- • 4 quarts = 1 gallon
Quick Reference
- • 1 gallon = 4 quarts
- • 1 gallon = 8 pints
- • 1 gallon = 16 cups
- • 1 gallon = 128 fl oz
Conversion Example
How many cups are in 3 quarts?
3 quarts × 4 cups/quart = 12 cups
Metric System
Based on powers of 10
Common Metric Prefixes
The metric system uses prefixes to indicate size. Each prefix represents a power of 10.
| Prefix | Symbol | Meaning | Example |
|---|---|---|---|
| kilo- | k | 1,000 | kilometer (km) |
| BASE | - | 1 | meter, liter, gram |
| centi- | c | 0.01 | centimeter (cm) |
| milli- | m | 0.001 | millimeter (mm) |
Memory Trick: King Henry
King Henry Died By Drinking Chocolate Milk
(Kilo, Hecto, Deca, Base, Deci, Centi, Milli)
Metric Units by Type
Length
Base: meter (m)
- • 1 km = 1,000 m
- • 1 m = 100 cm
- • 1 m = 1,000 mm
- • 1 cm = 10 mm
Mass (Weight)
Base: gram (g)
- • 1 kg = 1,000 g
- • 1 g = 1,000 mg
- • 1 metric ton = 1,000 kg
Capacity
Base: liter (L)
- • 1 L = 1,000 mL
- • 1 kL = 1,000 L
- • 1 mL = 1 cm³
Time Measurements
Units and conversions
Units of Time
Basic Units
- • 60 seconds = 1 minute
- • 60 minutes = 1 hour
- • 24 hours = 1 day
- • 7 days = 1 week
Calendar Units
- • 365 days = 1 year
- • 12 months = 1 year
- • 52 weeks = 1 year
- • 10 years = 1 decade
Elapsed Time Example
A movie starts at 2:45 PM and ends at 5:10 PM. How long is the movie?
From 2:45 to 3:00 = 15 minutes
From 3:00 to 5:00 = 2 hours
From 5:00 to 5:10 = 10 minutes
Total: 2 hours 25 minutes
Temperature Scales
Fahrenheit and Celsius
Fahrenheit (°F)
- • Used in the United States
- • Water freezes at 32°F
- • Water boils at 212°F
- • Normal body temp ≈ 98.6°F
Celsius (°C)
- • Used in most countries
- • Water freezes at 0°C
- • Water boils at 100°C
- • Normal body temp ≈ 37°C
Conversion Formulas
°F to °C:
°C = (°F - 32) × 5/9
°C to °F:
°F = (°C × 9/5) + 32
Estimation Benchmarks
Common reference points
Standard Units
- • Paper clip ≈ 1 inch
- • Dollar bill ≈ 6 inches
- • Door height ≈ 7 feet
- • City block ≈ 1/10 mile
Metric Units
- • Fingernail width ≈ 1 cm
- • Hand span ≈ 20 cm
- • Door height ≈ 2 meters
- • Water bottle = 500 mL
Common Mistakes to Avoid
Mixing unit systems
Using metric and standard units together
✓ Convert to the same system before calculating
Wrong conversion factor
Using 100 instead of 1,000 for km to m
✓ Memorize key conversions or keep a reference
Decimal placement errors
Moving decimal wrong direction in metric
✓ Large to small → right, Small to large → left
Practice Problems
Test your understanding
Standard Units
Convert 4.5 yards to feet.
Metric Conversion
Convert 3,500 meters to kilometers.
Capacity
How many ounces are in 3.25 pounds?
Time
Convert 150 minutes to hours and minutes.
Temperature
If it's 86°F outside, what is the temperature in Celsius?
Show Answers
1. 4.5 yards × 3 ft/yd = 13.5 feet
2. 3,500 m ÷ 1,000 = 3.5 km
3. 3.25 × 16 = 52 ounces
4. 150 ÷ 60 = 2 R30, so 2 hours 30 minutes
5. (86 - 32) × 5/9 = 54 × 5/9 = 30°C
Key Takeaways
Two Systems: Know both standard (US) and metric units
Conversions: Use multiplication/division or move decimal points
Appropriate Units: Choose units that make sense for what you're measuring
Time & Temperature: Special units with unique conversion rules
Continue Learning
Ready to Practice?
Test your measurement knowledge with practice questions
