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 \\ - \square\square \\ \hline 21 \end{array}
(14) \begin{array}{r} 85 \\ - \square\square \\ \hline 33 \end{end{array}
(15) \begin{begin}{r} 85 \\ - \square\square \\ \hline 24 \end{array}
(16) \begin{array}{r} 85 \\ - \square\square \\ \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{end{array}
(3) \begin{array}{r} 34 \\ + 58 \\ \hline \end{array}
(4) \begin{array}{r} 69 \\ + 26 \\ \hline \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 \\ - \square\square \\ \hline 21 \end{array}
(14) \begin{array}{r} 85 \\ - \square\square \\ \hline 33 \end{end{array}
(15) \begin{begin}{r} 85 \\ - \square\square \\ \hline 24 \end{array}
(16) \begin{array}{r} 85 \\ - \square\square \\ \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{end{array}
(3) \begin{array}{r} 34 \\ + 58 \\ \hline \end{array}
(4) \begin{array}{r} 69 \\ + 26 \\ \hline \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" ], "new_concepts": [ "Inverse Operations", "Missing Number Problems" ], "current_concepts": [ "Column Subtraction", "Column Addition", "Inverse Operations", "Missing Number Problems" ] } ## Calculate column subtraction problems (9) to (12) $$ \begin{aligned} &\text{(9) } 85 - 21 = 64\ &\text{(10) } 85 - 33 = 52\ &\text{(11) } 85 - 24 = 61\ &\text{(12) } 85 - 35 = 50 \end{aligned} $$ ## Solve missing minuend problems (13) to (16) $$ \begin{aligned} &\text{(13) } \square - 21 = 85 \implies \square = 85 + 21 = 106\ &\text{(14) } \square - 33 = 85 \implies \square = 85 + 33 = 118\ &\text{(15) } \square - 24 = 85 \implies \square = 85 + 24 = 109\ &\text{(16) } \square - 35 = 85 \implies \square = 85 + 35 = 120 \end{aligned} $$ ## Calculate addition and subtraction problems (1) to (8) $$ \begin{aligned} &\text{(1) } 23 + 47 = 70\ &\text{(2) } 46 + 35 = 81\ &\text{(3) } 34 + 58 = 92\ &\text{(4) } 69 + 26 = 95\ &\text{(5) } 70 - 47 = 23\ &\text{(6) } 81 - 35 = 46\ &\text{(7) } 92 - 34 = 58\ &\text{(8) } 95 - 69 = 26 \end{aligned} $$ | No. | Problem | Answer | |---|---|---| | (1) | $23 + 47$ | $70$ | | (2) | $46 + 35$ | $81$ | | (3) | $34 + 58$ | $92$ | | (4) | $69 + 26$ | $95$ | | (5) | $70 - 47$ | $23$ | | (6) | $81 - 35$ | $46$ | | (7) | $92 - 34$ | $58$ | | (8) | $95 - 69$ | $26$ | | (9) | $85 - 21$ | $64$ | | (10) | $85 - 33$ | $52$ | | (11) | $85 - 24$ | $61$ | | (12) | $85 - 35$ | $50$ | | (13) | $\square - 21 = 85$ | $106$ | | (14) | $\square - 33 = 85$ | $118$ | | (15) | $\square - 24 = 85$ | $109$ | | (16) | $\square - 35 = 85$ | $120$ | { "subject": "Mathematics", "question_type": "Free Response", "knowledge_point": [ "Mathematics", "Algebra", "Arithmetic Operations" ] }

No.	Problem	Answer
(2)	\(46 + 35\)	\(81\)
(3)	\(34 + 58\)	\(92\)
(4)	\(69 + 26\)	\(95\)
(5)	\(70 - 47\)	\(23\)
(6)	\(81 - 35\)	\(46\)
(7)	\(92 - 34\)	\(58\)
(8)	\(95 - 69\)	\(26\)
(9)	\(85 - 21\)	\(64\)
(10)	\(85 - 33\)	\(52\)
(11)	\(85 - 24\)	\(61\)
(12)	\(85 - 35\)	\(50\)
(13)	\(\square - 21 = 85\)	\(106\)
(14)	\(\square - 33 = 85\)	\(118\)
(15)	\(\square - 24 = 85\)	\(109\)
(16)	\(\square - 35 = 85\)	\(120\)

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QUESTION IMAGE

Question

Explanation:

Calculate column subtraction problems (9) to (12)

Solve missing minuend problems (13) to (16)

Calculate addition and subtraction problems (1) to (8)

Answer: