Units of measurement are used to describe and compare different quantities, such as length, weight, time, and volume. Understanding units helps us measure things in everyday life and ensures consistent communication about sizes, distances, amounts, and more.

Common units include:
- Length: Inches (in), feet (ft), meters (m), kilometers (km), etc.
- Weight: Grams (g), kilograms (kg), pounds (lbs), etc.
- Time: Seconds, minutes, hours, etc.
- Volume: Milliliters (ml), liters (l), cups, gallons, etc.

Examples:

Example 1: Converting Units of Length
Convert 3 feet to inches:
Since 1 foot = 12 inches:
3 feet × 12 inches/foot = 36 inches.

Example 2: Measuring Time
If a movie lasts 2 hours and 30 minutes, how many minutes is that?
Convert 2 hours to minutes:
2 hours × 60 minutes/hour = 120 minutes
Add 30 minutes:
120 minutes + 30 minutes = 150 minutes.

Units of measurement are a practical tool for comparing and understanding the world around us, helping us with tasks like cooking, building, traveling, and managing schedules.

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