ATI TEAS GUIDE TO MATH | MEASUREMENTS AND CONVERSIONS

UNDERSTANDING MEASUREMENTS AND CONVERSIONS

 

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QUIZ QUESTIONS LISTED AT END OF REVIEW

Measurement and conversion questions are vitally important in any healthcare program, especially in nursing. You will be required to understand how to process these conversions to provide safe and efficient patient care through medication administration or other tasks. Measurement and conversion questions ask applicants to covert units of measurements between the metric system and English system.

ENGLISH SYSTEM CONVERSIONS

The English system of measurement uses weight, volume, and length as units of measure.

  • Weight is measured in ounces, pounds, and tons
  • Volume is measured in ounces, cups, pints, quarts, and gallons
  • Length is measured in inches, feet, yards, and miles

To understand conversions in the English system, you must know the equivalent measures for each step in the given measurement system. Here are some examples of measurement equivalents.

Measurement Type Equivalents  
Weight 16 ounces

2,000 pounds

= 1 pound

= 1 ton

Volume 8 ounces

2 cups

2 pints

4 quarts

= 1 cup

= 1 pint

= 1 quart

= 1 gallon

Length 12 inches

3 feet

5,280 feet

= 1 foot

= 1 yard

= 1 mile




 

METRIC SYSTEM CONVERSIONS 

The metric system of measurement use weight, volume, and length, but it uses a different set of units for measurement.

  • The basic unit of weight measurement is the gram
  • The basic unit of volume measurement is the liter
  • The basic unit of length measurement is the meter

In the metric system, each unit of measurement starts with a prefix that indicates whether the measurement is smaller than the basic unit or larger than the basic unit. Here are some examples of measurement equivalents.

Prefix Measurement Compared to Basic Unit Weight Volume Length
Kilo- 1,000 times Kilogram (kg) Kiloliter (kL) Kilometer (km)
Hecto- 100 times Hectogram (hg) Hectoliter (hL) Hectometer (hm)
Deka- 10 times Dekagram (dag) Dekaliter (daL) Dekameter (dam)
Basic Unit Basic Unit Gram (g) Liter (L) Meter (m)
Deci- 1/10 Decigram (dg) Deciliter (dL) Decimeter (dm)
Centi- 1/100 Centigram (cg) Centiliter (cL) Centimeter (cm)
Milli- 1/1,000 Milligram (mg) Milliliter (mL) Millimeter (mm)

 

UNDERSTANDING CONVERSIONS BETWEEN SYSTEMS 

To convert between measurements in either English and metric systems, you need to know the approximate equivalents between different units. Here are some examples of measurement equivalents.

English Measurement Metric Equivalent
1 kilogram Approximately 2.2 pounds
1 liter Approximately 1 quart
2.5 centimeters Approximately 1 inch
1 meter Approximately 1 yard




TEMPERATURE CONVERSIONS 

In the English system of measurement, temperature is measured on the Fahrenheit scale. In the metric system of measurement, temperature is measured on the Celsius scale. Here are some examples of measurement equivalents.

Celsius (Metric) Fahrenheit (English)
Freezing Point 0 32
Body Temperature 37 98.6
Boiling Point 100 212

 

To obtain an approximation of Celsius Temperature from a Fahrenheit Measurement, subtract 30 and then divide the total by 2.

MEASUREMENT TOOLS ON THE ATI TEAS

Measurement tools are tested on the ATI TEAS using three categories, based on weight, volume, or length.

  • Measurement tools for weight
    • Scales are used traditionally and vary in degrees of accuracy
  • Measurement tools for volume
    • Pipettes are measuring tubes or drops to measure small amounts of liquid with high precision
    • Measuring cups, flasks, and beakers provide less precise measurements for larger amounts of liquid
    • Graduated cylinders vary in size and are less precise than pipettes but more precise than measuring cups, flasks, and beakers
  • Measurement tools for length
    • Calipers are the most precise measuring tool and take measurements using two points
    • Rulers are the next most precise tool, followed by yardsticks and metersticks
    • Tape measures are used for measuring long distances
    • Odometers measure the distance traveled by a vehicle and would be appropriate for the measurement taken in miles or kilometers

ATI TEAS Math Measurements and Conversions

Quiz for ATI TEAS MATH REVIEW SERIES