Consider these two questions:
Which word is spelled correctly?
Which word is used correctly in the sentence?
They may sound similar, but they test different skills. A word can be spelled correctly while being inappropriate for the sentence in which it appears.
The same principle applies to mathematics. A question asking for the value of an expression is different from one asking which expression is equivalent to another.
Before choosing an answer, identify exactly what the question requires.
Look for words such as not, except, always, least, and most. These terms can completely change what you need to find.
A few extra seconds spent reading carefully can prevent a surprisingly large number of mistakes.
Grammar Challenges: Which Sentence Is Correct?
Grammar is one of the most common subjects used in “Which Is Correct?” quizzes because many sentences sound natural even when they contain a grammatical error.
For example, consider these two sentences:
