Rose correctly answered 70% of the 220 questions in a spelling bee. How many questions did she answer incorrectly?

To determine how many questions Rose answered incorrectly, we start by calculating the total number of questions she answered correctly. Since she correctly answered 70% of the 220 questions, we can find the correct answers by multiplying:

[

0.70 \times 220 = 154

]

This means Rose answered 154 questions correctly. To find out how many questions she answered incorrectly, we subtract the number of questions she answered correctly from the total number of questions:

[

220 - 154 = 66

]

Thus, the number of questions that Rose answered incorrectly is 66. This matches the first choice, which is the correct answer. Understanding this calculation reinforces the concept of percentages and the relationship between correct and incorrect answers in a set of questions.