Before Fractions May Be Added or Subtracted, They Must All

question 27

Multiple Choice

Before fractions may be added or subtracted, they must all have the same:

• A) divisor
• B) denominator
• C) numerator
• D) dividend

---

Definitions:

NREM Sleep

The period of sleep outside of REM sleep, characterized by slower brain waves, reduced eye movement, and lack of dreaming, which is associated with physical recovery and memory consolidation.

REM Sleep

Rapid Eye Movement sleep, a sleep stage characterized by eye movements, increased brain activity, and vivid dreams.

Alpha Waves

The brain wave pattern associated with deep relaxation.

Delta Waves

Slow brain waves that are present in deep sleep and in brain activities associated with unconsciousness.