Convert Customary Units of Length
Some basic customary units of length and relation between them
Distance of customary units (Approximate)
We can relate the length of units with the given examples:
- The length of a quarter is about 1 inch.
- The length of man’s shoe is about 1 foot.
- The length of a Guitar is about 1 yard.
- The length of a runway at a large airport is about 1 mile.
Some other examples
- 1st image – Paper clip ( Approx 1 inch)
- 2nd image – Book (Approx 1 feet)
- 3rd image – Width of door (Approx 1 yard)
Conversion between the units
Example 1:
Convert 5 feet into inches
Since, 1 foot =12 inches, Therefore 5 feet = 5 × 12 = 60 inches
Example 2:
Convert 12 feet into yards,
Since, 1 foot = 1/3 yard,
Therefore, 12 feet = 1/3× 12 yard = 4 yards
Convert larger units into smaller units
To convert larger units into smaller units, we need to multiply with the related value.
Convert feet into inches
1. 6 feet into inches
Since 1 feet = 12 inches
Therefore, 6 feet = 6 × 12 inches
= 72 inches
2. 3 yards into feet
Since, 1 yard = 3 feet
Therefore, 3 yards = 3 × 3 feet
= 9 feet
3. 3 yards into inches
Since, 1 yard = 36 inches
Therefore, 3 yards = 36 × 3 inches
= 108 inches
Convert smaller units into larger units
To convert smaller units into larger unit we need to divide with the related value.
1. Convert inches into feet
Since 12 inches = 1 feet
So, 1 inch = 1/12 feet
Now, for 36 inches = 1/12× 36
Therefore, 36 inches = 3 feet
2. Convert feet into yard
Since, 3 feet = 1 yard
So, 1 foot = 1/3yard
Now, for 9 yard = 1/3× 9 yard
= 3 yards
Example 1:
What if you want to measure the distance from your house to your friend’s house? What unit you will use?
Answer:
- Standard System – Mile
- A mile is a long way if you think about it – 1 mile = 1760 yard / 5280 feet
Example 2:
Q1. What is the length of toy car in inches?
Answer: 6 Inches
Step 1: Place the ruler at the image.
Step 2: Check the numbers to count.
Concept Map
What have we learned
- Student have learned about the identification of units of length.
- Convert smaller units to large unit
- Convert larger unit to smaller unit
- With different model of images students have become familiar of units of length.
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