\
\begin{array}{r@{\quad}c@{\quad}c@{\quad}c@{\quad}c}
& 2, & 7 & 4 & \square \\
- & 1, & \square & \square & 4 \\
\hline
& \square, & 5 & 4 & 1
\end{array}
\

Question

\
\begin{array}{r@{\quad}c@{\quad}c@{\quad}c@{\quad}c}
  & 2, & 7 & 4 & \square \\
- & 1, & \square & \square & 4 \\
\hline
  & \square, & 5 & 4 & 1
\end{array}
\

Accepted Answer

{ "quality": "clear", "question_count": 1, "skills_matched": [ "step_cot", "blank_filling_formatter", "explain_then_answer", "tutor", "mastery_adaptive_brevity" ], "needs_drawing": false, "concepts_used": [ "Multi-digit Subtraction" ], "new_concepts": [ "Missing Digit Subtraction", "Column Subtraction with Regrouping" ], "current_concepts": [ "Multi-digit Subtraction", "Missing Digit Subtraction", "Column Subtraction with Regrouping" ] } ## Analyze the ones column Using the *Multi-digit Subtraction* knowledge point $$ \begin{aligned} &A - 4 = 1\ &A = 5 \end{aligned} $$ ## Analyze the tens column Using the *Multi-digit Subtraction* knowledge point $$ \begin{aligned} &4 - B = 4\ &B = 0 \end{aligned} $$ ## Analyze the hundreds column Using the *Multi-digit Subtraction* knowledge point $$ \begin{aligned} &7 - C = 5\ &C = 2 \end{aligned} $$ ## Analyze the thousands column Using the *Multi-digit Subtraction* knowledge point $$ \begin{aligned} &2 - 1 = D\ &D = 1 \end{aligned} $$ ## Verify the complete subtraction Using the *Multi-digit Subtraction* knowledge point $$ 2,745 - 1,204 = 1,541 $$ The completed subtraction problem is: $$ \begin{array}{r@{\quad}c@{\quad}c@{\quad}c@{\quad}c} & 2, & 7 & 4 & \blank{5} \ - & 1, & \blank{2} & \blank{0} & 4 \ \hline & \blank{1}, & 5 & 4 & 1 \end{array} $$ { "subject": "Mathematics", "question_type": "Fill-in-the-blank", "knowledge_point": [ "Mathematics", "Algebra", "Multi-digit Subtraction" ] }

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Analyze the ones column

Analyze the tens column

Analyze the hundreds column

Analyze the thousands column

Verify the complete subtraction

Answer: