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## 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:

1. The length of a quarter is about 1 inch.
1. The length of man’s shoe is about 1 foot.
1. The length of a Guitar is about 1 yard.
1. 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?

1. Standard System – Mile
2. 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?

Step 1: Place the ruler at the image.

Step 2: Check the numbers to count.

### 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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