b157b
(9) \begin{array}{r} 85 \\ - 21 \\ \hline \end{array}
(10) \begin{array}{r} 85 \\ - 33 \\ \hline \end{array}
(11) \begin{array}{r} 85 \\ - 24 \\ \hline \end{array}
(12) \begin{array}{r} 85 \\ - 35 \\ \hline \end{array}
(13) \begin{array}{r} 85 \\ - \box\box \\ \hline 21 \end{array}
(14) \begin{array}{r} 85 \\ - \box\box \\ \hline 33 \end{end{array}
(15) \begin{array}{r} 85 \\ - \box\box \\ \hline 24 \end{array}
(16) \begin{array}{r} 85 \\ - \box\box \\ \hline 35 \end{array}

b158a kumon
addition and subtraction of 2-digit numbers
add, subtract or fill in the missing numbers.
(1) \begin{array}{r} 23 \\ + 47 \\ \hline \end{array}
(2) \begin{array}{r} 46 \\ + 35 \\ \hline \end{array}
(3) \begin{array}{r} 34 \\ + 58 \\ \hline \end{array}
(4) \begin{array}{r} 69 \\ + 26 \\ \hline \end{end{array}
(5) \begin{array}{r} 70 \\ - 47 \\ \hline \end{array}
(6) \begin{array}{r} 81 \\ - 35 \\ \hline \end{array}
(7) \begin{array}{r} 92 \\ - 34 \\ \hline \end{array}
(8) \begin{array}{r} 95 \\ - 69 \\ \hline \end{array}

Question

b157b
(9) \begin{array}{r} 85 \\ - 21 \\ \hline \end{array}
(10) \begin{array}{r} 85 \\ - 33 \\ \hline \end{array}
(11) \begin{array}{r} 85 \\ - 24 \\ \hline \end{array}
(12) \begin{array}{r} 85 \\ - 35 \\ \hline \end{array}
(13) \begin{array}{r} 85 \\ - \box\box \\ \hline 21 \end{array}
(14) \begin{array}{r} 85 \\ - \box\box \\ \hline 33 \end{end{array}
(15) \begin{array}{r} 85 \\ - \box\box \\ \hline 24 \end{array}
(16) \begin{array}{r} 85 \\ - \box\box \\ \hline 35 \end{array}

b158a kumon
addition and subtraction of 2-digit numbers
add, subtract or fill in the missing numbers.
(1) \begin{array}{r} 23 \\ + 47 \\ \hline \end{array}
(2) \begin{array}{r} 46 \\ + 35 \\ \hline \end{array}
(3) \begin{array}{r} 34 \\ + 58 \\ \hline \end{array}
(4) \begin{array}{r} 69 \\ + 26 \\ \hline \end{end{array}
(5) \begin{array}{r} 70 \\ - 47 \\ \hline \end{array}
(6) \begin{array}{r} 81 \\ - 35 \\ \hline \end{array}
(7) \begin{array}{r} 92 \\ - 34 \\ \hline \end{array}
(8) \begin{array}{r} 95 \\ - 69 \\ \hline \end{array}

Accepted Answer

{ "quality": "clear", "question_count": 16, "skills_matched": [ "step_cot", "table_formatter", "explain_then_answer", "quick" ], "needs_drawing": false, "concepts_used": [ "Column Subtraction", "Column Addition", "Inverse Operations", "Missing Number Problems" ], "new_concepts": [], "current_concepts": [ "Column Subtraction", "Column Addition", "Inverse Operations", "Missing Number Problems" ] } ## Solve standard column operations (1) to (12) $$ \begin{aligned} &\text{(1) } 23 + 47 = 70\ &\text{(2) } 46 + 35 = 81\ &\text{(3) } 34 + 58 = 92\ &\text{(4) } 69 + 26 = 95\ &\text{(5) } 70 - 47 = 23\ &\text{(6) } 81 - 35 = 46\ &\text{(7) } 92 - 34 = 58\ &\text{(8) } 95 - 69 = 26\ &\text{(9) } 85 - 21 = 64\ &\text{(10) } 85 - 33 = 52\ &\text{(11) } 85 - 24 = 61\ &\text{(12) } 85 - 35 = 50 \end{aligned} $$ ## Solve missing number problems (13) to (16) $$ \begin{aligned} &\text{(13) } 85 - X = 21 \implies X = 85 - 21 = 64\ &\text{(14) } 85 - X = 33 \implies X = 85 - 33 = 52\ &\text{(15) } 85 - X = 24 \implies X = 85 - 24 = 61\ &\text{(16) } 85 - X = 35 \implies X = 85 - 35 = 50 \end{aligned} $$ | No. | Answer | |---|---| | (1) | $70$ | | (2) | $81$ | | (3) | $92$ | | (4) | $95$ | | (5) | $23$ | | (6) | $46$ | | (7) | $58$ | | (8) | $26$ | | (9) | $64$ | | (10) | $52$ | | (11) | $61$ | | (12) | $50$ | | (13) | $64$ | | (14) | $52$ | | (15) | $61$ | | (16) | $50$ | { "subject": "Mathematics", "question_type": "Fill-in-the-blank", "knowledge_point": [ "Mathematics", "Algebra", "Missing Number Problems" ] }

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QUESTION IMAGE

Question

Explanation:

Solve standard column operations (1) to (12)

Solve missing number problems (13) to (16)

Answer:

No.	Answer
(2)	\(81\)
(3)	\(92\)
(4)	\(95\)
(5)	\(23\)
(6)	\(46\)
(7)	\(58\)
(8)	\(26\)
(9)	\(64\)
(10)	\(52\)
(11)	\(61\)
(12)	\(50\)
(13)	\(64\)
(14)	\(52\)
(15)	\(61\)
(16)	\(50\)