Question

what should he do next?

simplify his answer.
find a common denominator.
add the numerators.
convert the fractions.

Explanation:

<pre_analysis>
{
"quality": "clear",
"question_count": 1,
"skills_matched": [
"step_cot",
"multiple_choice_formatter",
"explain_then_answer",
"quick"
],
"needs_drawing": false,
"concepts_used": [
"Fraction Addition",
"Like Denominators",
"Common Denominator",
"Equivalent Fractions"
],
"new_concepts": [
"Simplifying Fractions"
],
"current_concepts": [
"Fraction Addition",
"Like Denominators",
"Common Denominator",
"Equivalent Fractions",
"Simplifying Fractions"
]
}
</pre_analysis>

<reasoning>

Analyze the current step in the image

\[
\frac{3}{6} + \frac{3}{9}
ightarrow \frac{9}{18} + \frac{6}{18} = \frac{15}{18}
\]

Determine the next logical step

\[
\frac{15}{18} = \frac{15 \div 3}{18 \div 3} = \frac{5}{6}
\]
</reasoning>

<answer>
<mcq-correct>(A) Simplify his answer.</mcq-correct>
<mcq-option>(B) Find a common denominator.</mcq-option>
<mcq-option>(C) Add the numerators.</mcq-option>
<mcq-option>(D) Convert the fractions.</mcq-option>
</answer>

<post_analysis>
{
"subject": "Mathematics",
"question_type": "Multiple Choice",
"knowledge_point": [
"Mathematics",
"Algebra",
"Simplifying Fractions"
]
}
</post_analysis>

Answer:

<pre_analysis>
{
"quality": "clear",
"question_count": 1,
"skills_matched": [
"step_cot",
"multiple_choice_formatter",
"explain_then_answer",
"quick"
],
"needs_drawing": false,
"concepts_used": [
"Fraction Addition",
"Like Denominators",
"Common Denominator",
"Equivalent Fractions"
],
"new_concepts": [
"Simplifying Fractions"
],
"current_concepts": [
"Fraction Addition",
"Like Denominators",
"Common Denominator",
"Equivalent Fractions",
"Simplifying Fractions"
]
}
</pre_analysis>

<reasoning>

Analyze the current step in the image

\[
\frac{3}{6} + \frac{3}{9}
ightarrow \frac{9}{18} + \frac{6}{18} = \frac{15}{18}
\]

Determine the next logical step

\[
\frac{15}{18} = \frac{15 \div 3}{18 \div 3} = \frac{5}{6}
\]
</reasoning>

<answer>
<mcq-correct>(A) Simplify his answer.</mcq-correct>
<mcq-option>(B) Find a common denominator.</mcq-option>
<mcq-option>(C) Add the numerators.</mcq-option>
<mcq-option>(D) Convert the fractions.</mcq-option>
</answer>

<post_analysis>
{
"subject": "Mathematics",
"question_type": "Multiple Choice",
"knowledge_point": [
"Mathematics",
"Algebra",
"Simplifying Fractions"
]
}
</post_analysis>