U.S. Customary Units of Length
U.S. customary units of length in Grade 4 math include inches, feet, yards, and miles, with key conversions: 12 inches = 1 foot, 3 feet = 1 yard, and 5,280 feet = 1 mile. Covered in Chapter 2 of Saxon Math Intermediate 4, students practice converting between these units—for example, a 4-foot bookshelf is 48 inches, and a 5-yard room is 15 feet. These conversions appear frequently in measurement word problems and real-world applications like construction and geography.
Key Concepts
Property The standard system for measuring length in the United States. Key equivalents are 12 inches = 1 foot, 3 feet = 1 yard, and 5280 feet = 1 mile.
Examples A bookshelf that is 4 feet tall is $4 \times 12 = 48$ inches tall. A room that is 5 yards long is $5 \times 3 = 15$ feet long.
Explanation Think of these units like building blocks for distance! Tiny inches stack up to make a foot, a few feet make a yardstick for bigger things, and a whole lot of feet stretch out to become a mile for long journeys. We use this system every day in the U.S.!
Common Questions
What are the U.S. customary units of length?
From smallest to largest for common use: inch (in), foot (ft), yard (yd), and mile (mi). The key equivalences are 12 in = 1 ft, 3 ft = 1 yd, and 5,280 ft = 1 mi.
How many inches are in 2 feet?
2 feet = 2 × 12 = 24 inches.
How many feet are in 4 yards?
4 yards = 4 × 3 = 12 feet.
When do Grade 4 students learn U.S. customary length units?
These conversions are introduced in Chapter 2 of Saxon Math Intermediate 4 as part of measurement and problem-solving.
What are common everyday objects measured in U.S. units?
A pencil is about 7 inches; a door is about 7 feet tall; a football field is 100 yards; the distance from New York to Los Angeles is about 2,800 miles.
How do you convert yards to inches?
First convert yards to feet (multiply by 3), then feet to inches (multiply by 12). Or multiply directly: 1 yard = 36 inches, so multiply yards by 36.