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### Course: 4th grade > Unit 14

Lesson 7: Converting units of length- Converting metric units of length
- Convert to smaller units (mm, cm, m, & km)
- Converting feet to inches
- Converting yards into inches
- Convert to smaller units (in, ft, yd, & mi)
- Metric units of length review (mm, cm, m, & km)
- US Customary units of length review (in, ft, yd, & mi)

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# US Customary units of length review (in, ft, yd, & mi)

Review the size of inches, feet, yards, and miles and how to convert between them. Then, try some practice problems.

## Summary of customary units of distance

Inches | Feet | Yards | Miles |
---|---|---|---|

## What is distance?

Distance measures length. For example, the length of a snake is how long the snake is.

In the US customary system of measurement, the most common units of distance are inches, feet, yards, and miles.

### How big are customary units of distance?

The length of a quarter is about $1$

**inch**.The length of a 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**.*Want to learn more about customary units of distance? Check out this video.*

## Converting larger units to smaller units

To convert larger units to smaller units we multiply the number of larger units by the green conversion factor for the appropriate smaller units.

**Example: Converting feet to inches**

## Converting smaller units to larger units

To convert smaller units to larger units we divide the number of smaller units by the green conversion factor for the appropriate larger units.

**Example: Converting inches to feet**

**Example: Converting yards to miles**

*Want to learn more about converting between customary units of distance? Check out this video.*

## Practice set 2: Converting distance units

*Want to try more problems like this? Check out these exercises:*

Convert larger units to smaller units

Converting between units

## Want to join the conversation?

- how do i know how much a mile is?(5 votes)
- This is something that you will probably want to memorize. A mile is 5280 feet.

Once you have that in your memory, you can then use math to determine how many yards a mile is and all sorts of other measurements.(18 votes)

- Thank You! this is really helpful but is there a faster way or less confusing way(5 votes)
- I find the metric system is easier and faster, because its all based on tens(12 votes)

- Is there anything smaller than a millemeter(7 votes)
- The micro-, nano-, picto-, and femto- are all prefixes that indicate sizes smaller than the milli-.(12 votes)

- How did they come up with this system of measurement?(8 votes)
- if there is anything smaller than a millimeter would it be like a billionth of a meter(6 votes)
- millimeter = 1/1,000 meter.

micrometer = 1/1,000,000 meter.

nanometer = 1/1,000,000,000 meter.

and there is no limit to how many units there should be. whenever we find a length in the real world that we need to express a lot of times and we don't have a unit that's close to this length, we can create a new unit of length.(0 votes)

- how many yards are in 14 miles(6 votes)
- the answer is 24640 because of 1760 yards in a mile and

1760 x 14 = 24640(5 votes)

- how much is three yards(4 votes)
- 3 yards in meters is 2.7432m.

3 yards in feet is 9ft.(3 votes)

- What unit of measure would you use to measure the length of a soda can? Inches, centimeters, or millimeters?(2 votes)
- Inches, because cm's is too small and mm's is
*WAY*too small(4 votes)

- Suiii Math is cool 😎😏(3 votes)
- At10:35am I got a question asking how much 4 miles is, how much is 1 mile(2 votes)
- one mile is 1760 yards and 4 miles is 7040 yards.(3 votes)