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# Measurement for Praxis I: Pre-Professional Skills Test Study Guide (page 2)

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Updated on Jul 5, 2011

### Converting Units

When performing mathematical operations, it may be necessary to convert units of measure to simplify a problem. Units of measure are converted by using either multiplication or division.

• To convert from a larger unit into a smaller unit, multiply the given number of larger units by the number of smaller units in only one of the larger units:
• (given number of the larger units) × (the number of smaller units per larger unit) = answer in smaller units

For example, to find the number of inches in five feet, multiply 5, the number of larger units, by 12, the number of inches in one foot:

5 feet = ? inches

5 feet × 12 (the number of inches in a single foot) = 60 inches: 5 ft. × = 60 in.

Therefore, there are 60 inches in five feet.

##### Example

Change 3.5 tons to pounds.

3.5 tons = ? pounds

3.5 tons × = 7,000 pounds

Therefore, there are 7,000 pounds in 3.5 tons.

• To change a smaller unit to a larger unit, divide the given number of smaller units by the number of smaller units in only one of the larger units:
• For example, to find the number of pints in 64 ounces, divide 64, the number of smaller units, by 16, the number of ounces in one pint.

64 ounces = ? pints

Therefore, 64 ounces equals four pints.

##### Example

Change 32 ounces to pounds.

32 ounces = ? pounds

Therefore, 32 ounces equals two pounds.

### Basic Operations with Measurement

You may need to add, subtract, multiply, and divide with measurement. The mathematical rules needed for each of these operations with measurement follow.