Mathematics - TEAS Study Guide | Nurse.org
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Fractions – Adding & Subtracting

Why This Matters for Nursing: Medication doses often come in fractions. If a patient needs ½ tablet in the morning and ¼ tablet at night, you need to know the total: ¾ tablet per day.

What You Need to Know

A fraction represents a part of a whole. It has two parts:

  • Numerator (top): How many parts you have
  • Denominator (bottom): How many equal parts make the whole
½ ¼ ¾ + =

To add or subtract fractions, the denominators MUST be the same. If they're not, you need to find a common denominator first.

The Golden Rule

Same denominators? Just add/subtract the numerators. Keep the denominator the same.


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