b162a kumon
subtraction of 3-digit numbers 1

subtract.
(1) \begin{array}{r} 134 \\ -\phantom{0}12 \\ \hline \end{array}
(5) \begin{array}{r} 154 \\ -\phantom{0}25 \\ \hline \end{array}
(2) \begin{array}{r} 134 \\ -\phantom{0}14 \\ \hline \end{array}
(6) \begin{array}{r} 154 \\ -\phantom{0}27 \\ \hline \end{array}
(3) \begin{array}{r} 134 \\ -\phantom{0}16 \\ \hline \end{array}
(7) \begin{array}{r} 154 \\ -\phantom{0}37 \\ \hline \end{array}
(4) \begin{array}{r} 134 \\ -\phantom{0}18 \\ \hline \end{array}
(8) \begin{array}{r} 154 \\ -\phantom{0}49 \\ \hline \end{array}

Question

b162a kumon
subtraction of 3-digit numbers 1

subtract.
(1) \begin{array}{r} 134 \\ -\phantom{0}12 \\ \hline \end{array}
(5) \begin{array}{r} 154 \\ -\phantom{0}25 \\ \hline \end{array}
(2) \begin{array}{r} 134 \\ -\phantom{0}14 \\ \hline \end{array}
(6) \begin{array}{r} 154 \\ -\phantom{0}27 \\ \hline \end{array}
(3) \begin{array}{r} 134 \\ -\phantom{0}16 \\ \hline \end{array}
(7) \begin{array}{r} 154 \\ -\phantom{0}37 \\ \hline \end{array}
(4) \begin{array}{r} 134 \\ -\phantom{0}18 \\ \hline \end{array}
(8) \begin{array}{r} 154 \\ -\phantom{0}49 \\ \hline \end{array}

Accepted Answer

{ "quality": "clear", "question_count": 18, "skills_matched": [ "step_cot", "table_formatter", "explain_then_answer", "quick" ], "needs_drawing": false, "concepts_used": [ "Column Subtraction", "Subtraction with Regrouping" ], "new_concepts": [], "current_concepts": [ "Column Subtraction", "Subtraction with Regrouping" ] } ## Calculate page B161b column 1 $$ \begin{aligned} (11)\quad &145 - 10 = 135 \ (12)\quad &145 - 21 = 124 \ (13)\quad &145 - 13 = 132 \ (14)\quad &145 - 32 = 113 \ (15)\quad &145 - 44 = 101 \end{aligned} $$ ## Calculate page B161b column 2 $$ \begin{aligned} (16)\quad &173 - 22 = 151 \ (17)\quad &173 - 23 = 150 \ (18)\quad &173 - 26 = 147 \ (19)\quad &173 - 27 = 146 \ (20)\quad &173 - 29 = 144 \end{aligned} $$ ## Calculate page B162a columns 1 and 2 $$ \begin{aligned} (1)\quad &134 - 12 = 122 \ (2)\quad &134 - 14 = 120 \ (3)\quad &134 - 16 = 118 \ (4)\quad &134 - 18 = 116 \ (5)\quad &154 - 25 = 129 \ (6)\quad &154 - 27 = 127 \ (7)\quad &154 - 37 = 117 \ (8)\quad &154 - 49 = 105 \end{aligned} $$ | No. | Problem | Answer | |---|---|---| | (11) | $145 - 10$ | $135$ | | (12) | $145 - 21$ | $124$ | | (13) | $145 - 13$ | $132$ | | (14) | $145 - 32$ | $113$ | | (15) | $145 - 44$ | $101$ | | (16) | $173 - 22$ | $151$ | | (17) | $173 - 23$ | $150$ | | (18) | $173 - 26$ | $147$ | | (19) | $173 - 27$ | $146$ | | (20) | $173 - 29$ | $144$ | | (1) | $134 - 12$ | $122$ | | (2) | $134 - 14$ | $120$ | | (3) | $134 - 16$ | $118$ | | (4) | $134 - 18$ | $116$ | | (5) | $154 - 25$ | $129$ | | (6) | $154 - 27$ | $127$ | | (7) | $154 - 37$ | $117$ | | (8) | $154 - 49$ | $105$ | { "subject": "Mathematics", "question_type": "Free Response", "knowledge_point": [ "Mathematics", "Algebra", "Column Subtraction" ] }

No.	Problem	Answer
(12)	\(145 - 21\)	\(124\)
(13)	\(145 - 13\)	\(132\)
(14)	\(145 - 32\)	\(113\)
(15)	\(145 - 44\)	\(101\)
(16)	\(173 - 22\)	\(151\)
(17)	\(173 - 23\)	\(150\)
(18)	\(173 - 26\)	\(147\)
(19)	\(173 - 27\)	\(146\)
(20)	\(173 - 29\)	\(144\)
(1)	\(134 - 12\)	\(122\)
(2)	\(134 - 14\)	\(120\)
(3)	\(134 - 16\)	\(118\)
(4)	\(134 - 18\)	\(116\)
(5)	\(154 - 25\)	\(129\)
(6)	\(154 - 27\)	\(127\)
(7)	\(154 - 37\)	\(117\)
(8)	\(154 - 49\)	\(105\)

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Question

Explanation:

Calculate page B161b column 1

Calculate page B161b column 2

Calculate page B162a columns 1 and 2

Answer: