Question

b164b
(9) \

$$\begin{array}{r} 261 \\\\ -\\phantom{0}26 \\end{array}$$

(14) \

$$\begin{array}{r} 225 \\\\ -\\phantom{0}42 \\end{array}$$

(10) \

$$\begin{array}{r} 261 \\\\ -\\phantom{0}24 \\end{array}$$

(15) \

$$\begin{array}{r} 225 \\\\ -\\phantom{0}72 \\end{array}$$

(11) \

$$\begin{array}{r} 261 \\\\ -\\phantom{0}28 \\end{array}$$

(16) \

$$\begin{array}{r} 225 \\\\ -\\phantom{0}52 \\end{array}$$

(12) \

$$\begin{array}{r} 261 \\\\ -\\phantom{0}35 \\end{array}$$

(17) \

$$\begin{array}{r} 225 \\\\ -\\phantom{0}63 \\end{array}$$

\

$$\begin{array}{r} 261 \\\\ -\\phantom{0}39 \\end{array}$$

(18) \

$$\begin{array}{r} 225 \\\\ -\\phantom{0}93 \\end{array}$$

b165a kumon
subtraction of 3-digit numbers 1
subtract.
(1) \

$$\begin{array}{r} 172 \\\\ -\\phantom{0}36 \\end{array}$$

(5) \

$$\begin{array}{r} 258 \\\\ -\\phantom{0}62 \\end{array}$$

(2) \

$$\begin{array}{r} 172 \\\\ -\\phantom{0}37 \\end{array}$$

(6) \

$$\begin{array}{r} 258 \\\\ -\\phantom{0}82 \\end{array}$$

(3) \

$$\begin{array}{r} 172 \\\\ -\\phantom{0}45 \\end{array}$$

(7) \

$$\begin{array}{r} 258 \\\\ -\\phantom{0}73 \\end{array}$$

(4) \

$$\begin{array}{r} 172 \\\\ -\\phantom{0}58 \\end{array}$$

(8) \

$$\begin{array}{r} 258 \\\\ -\\phantom{0}94 \\end{array}$$

Explanation:

<pre_analysis>
{
"quality": "clear",
"question_count": 18,
"skills_matched": [
"step_cot",
"table_formatter",
"explain_then_answer",
"quick"
],
"needs_drawing": false,
"concepts_used": [
"Column Subtraction",
"Three-Digit Subtraction"
],
"new_concepts": [],
"current_concepts": [
"Column Subtraction",
"Three-Digit Subtraction"
]
}
</pre_analysis>

<reasoning>

Calculate column subtraction for page B164b

\[

$$\begin{aligned} (9)\quad &261 - 26 = 235 \\ (10)\quad &261 - 24 = 237 \\ (11)\quad &261 - 28 = 233 \\ (12)\quad &261 - 35 = 226 \\ (13)\quad &261 - 39 = 222 \\ (14)\quad &225 - 42 = 183 \\ (15)\quad &225 - 72 = 153 \\ (16)\quad &225 - 52 = 173 \\ (17)\quad &225 - 63 = 162 \\ (18)\quad &225 - 93 = 132 \end{aligned}$$

\]

Calculate column subtraction for page B165a

\[

$$\begin{aligned} (1)\quad &172 - 36 = 136 \\ (2)\quad &172 - 37 = 135 \\ (3)\quad &172 - 45 = 127 \\ (4)\quad &172 - 58 = 114 \\ (5)\quad &258 - 62 = 196 \\ (6)\quad &258 - 82 = 176 \\ (7)\quad &258 - 73 = 185 \\ (8)\quad &258 - 94 = 164 \end{aligned}$$

\]
</reasoning>

<answer>

No.	Problem	Answer
(10)	\(261 - 24\)	\(237\)
(11)	\(261 - 28\)	\(233\)
(12)	\(261 - 35\)	\(226\)
(13)	\(261 - 39\)	\(222\)
(14)	\(225 - 42\)	\(183\)
(15)	\(225 - 72\)	\(153\)
(16)	\(225 - 52\)	\(173\)
(17)	\(225 - 63\)	\(162\)
(18)	\(225 - 93\)	\(132\)
(1)	\(172 - 36\)	\(136\)
(2)	\(172 - 37\)	\(135\)
(3)	\(172 - 45\)	\(127\)
(4)	\(172 - 58\)	\(114\)
(5)	\(258 - 62\)	\(196\)
(6)	\(258 - 82\)	\(176\)
(7)	\(258 - 73\)	\(185\)
(8)	\(258 - 94\)	\(164\)

</answer>

<post_analysis>
{
"subject": "Mathematics",
"question_type": "Free Response",
"knowledge_point": [
"Mathematics",
"Algebra",
"Three-Digit Subtraction"
]
}
</post_analysis>

Answer:

<pre_analysis>
{
"quality": "clear",
"question_count": 18,
"skills_matched": [
"step_cot",
"table_formatter",
"explain_then_answer",
"quick"
],
"needs_drawing": false,
"concepts_used": [
"Column Subtraction",
"Three-Digit Subtraction"
],
"new_concepts": [],
"current_concepts": [
"Column Subtraction",
"Three-Digit Subtraction"
]
}
</pre_analysis>

<reasoning>

Calculate column subtraction for page B164b

\[

$$\begin{aligned} (9)\quad &261 - 26 = 235 \\ (10)\quad &261 - 24 = 237 \\ (11)\quad &261 - 28 = 233 \\ (12)\quad &261 - 35 = 226 \\ (13)\quad &261 - 39 = 222 \\ (14)\quad &225 - 42 = 183 \\ (15)\quad &225 - 72 = 153 \\ (16)\quad &225 - 52 = 173 \\ (17)\quad &225 - 63 = 162 \\ (18)\quad &225 - 93 = 132 \end{aligned}$$

\]

Calculate column subtraction for page B165a

\[

$$\begin{aligned} (1)\quad &172 - 36 = 136 \\ (2)\quad &172 - 37 = 135 \\ (3)\quad &172 - 45 = 127 \\ (4)\quad &172 - 58 = 114 \\ (5)\quad &258 - 62 = 196 \\ (6)\quad &258 - 82 = 176 \\ (7)\quad &258 - 73 = 185 \\ (8)\quad &258 - 94 = 164 \end{aligned}$$

\]
</reasoning>

<answer>

No.	Problem	Answer
(10)	\(261 - 24\)	\(237\)
(11)	\(261 - 28\)	\(233\)
(12)	\(261 - 35\)	\(226\)
(13)	\(261 - 39\)	\(222\)
(14)	\(225 - 42\)	\(183\)
(15)	\(225 - 72\)	\(153\)
(16)	\(225 - 52\)	\(173\)
(17)	\(225 - 63\)	\(162\)
(18)	\(225 - 93\)	\(132\)
(1)	\(172 - 36\)	\(136\)
(2)	\(172 - 37\)	\(135\)
(3)	\(172 - 45\)	\(127\)
(4)	\(172 - 58\)	\(114\)
(5)	\(258 - 62\)	\(196\)
(6)	\(258 - 82\)	\(176\)
(7)	\(258 - 73\)	\(185\)
(8)	\(258 - 94\)	\(164\)

</answer>

<post_analysis>
{
"subject": "Mathematics",
"question_type": "Free Response",
"knowledge_point": [
"Mathematics",
"Algebra",
"Three-Digit Subtraction"
]
}
</post_analysis>