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Michael answered 21 out of 30 questions correctly. To determine the percentage of questions he got incorrect:

1. First, calculate the number of incorrect questions:
   \[
   30 - 21 = 9 \text{ incorrect questions}.
   \]

2. Now, calculate the percentage of incorrect answers:
   \[
   \frac{9}{30} \times 100 = 30\%.
   \]

Therefore, Michael got **30%** of the questions incorrect. The correct answer is **B. 30%**.

Would you like more details on any part of the process?

Here are 5 related questions for further practice:
1. What percentage of questions did Michael get correct?
2. If Michael answered 18 out of 40 questions correctly, what percentage did he get incorrect?
3. If another student answered 25 out of 50 questions correctly, what percentage did they get incorrect?
4. If the total number of questions was 25 and Michael got 5 wrong, what is the percentage of incorrect answers?
5. How would the percentage change if Michael had answered 24 questions correctly instead of 21?

**Tip:** When dealing with percentages, remember to divide the part by the whole, then multiply by 100.

On the last math assessment, Michael got 21 out of 30 questions correct. What percentage of questions did Michael get incorrect?

Learn how to calculate the percentage of incorrect answers for a 30-question math test. This problem demonstrates key concepts in percentages and basic arithmetic, suitable for students in Grades 4-6. Michael answered 21 out of 30 questions correctly, resulting in 30% incorrect answers.

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