Question

b163b
(9) 126 - 10
(10) 126 - 31
(11) 126 - 51
(12) 126 - 72
(13) 126 - 92
(14) 216 - 21
(15) 216 - 41
(16) 216 - 62
(17) 216 - 82
(18) 216 - 93

b164a kumon
subtraction of 3-digit numbers 1
subtract.
(1) 144 - 16
(2) 144 - 18
(3) 144 - 17
(4) 144 - 19
(5) 144 - 61
(6) 144 - 81
(7) 144 - 71
(8) 144 - 91

Explanation:

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

<reasoning>

Calculate page B163b left column

\[

$$\begin{aligned} (9)\quad &126 - 10 = 116 \\ (10)\quad &126 - 31 = 95 \\ (11)\quad &126 - 51 = 75 \\ (12)\quad &126 - 72 = 54 \\ (13)\quad &126 - 92 = 34 \end{aligned}$$

\]

Calculate page B163b right column

\[

$$\begin{aligned} (14)\quad &216 - 21 = 195 \\ (15)\quad &216 - 41 = 175 \\ (16)\quad &216 - 62 = 154 \\ (17)\quad &216 - 82 = 134 \\ (18)\quad &216 - 93 = 123 \end{aligned}$$

\]

Calculate page B164a left and right columns

\[

$$\begin{aligned} (1)\quad &144 - 16 = 128 \\ (2)\quad &144 - 18 = 126 \\ (3)\quad &144 - 17 = 127 \\ (4)\quad &144 - 19 = 125 \\ (5)\quad &144 - 61 = 83 \\ (6)\quad &144 - 81 = 63 \\ (7)\quad &144 - 71 = 73 \\ (8)\quad &144 - 91 = 53 \end{aligned}$$

\]
</reasoning>

<answer>

No.	Problem	Answer
(10)	\(126 - 31\)	\(95\)
(11)	\(126 - 51\)	\(75\)
(12)	\(126 - 72\)	\(54\)
(13)	\(126 - 92\)	\(34\)
(14)	\(216 - 21\)	\(195\)
(15)	\(216 - 41\)	\(175\)
(16)	\(216 - 62\)	\(154\)
(17)	\(216 - 82\)	\(134\)
(18)	\(216 - 93\)	\(123\)
(1)	\(144 - 16\)	\(128\)
(2)	\(144 - 18\)	\(126\)
(3)	\(144 - 17\)	\(127\)
(4)	\(144 - 19\)	\(125\)
(5)	\(144 - 61\)	\(83\)
(6)	\(144 - 81\)	\(63\)
(7)	\(144 - 71\)	\(73\)
(8)	\(144 - 91\)	\(53\)

</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": [
"Three-Digit Subtraction",
"Subtraction with Regrouping"
],
"new_concepts": [],
"current_concepts": [
"Three-Digit Subtraction",
"Subtraction with Regrouping"
]
}
</pre_analysis>

<reasoning>

Calculate page B163b left column

\[

$$\begin{aligned} (9)\quad &126 - 10 = 116 \\ (10)\quad &126 - 31 = 95 \\ (11)\quad &126 - 51 = 75 \\ (12)\quad &126 - 72 = 54 \\ (13)\quad &126 - 92 = 34 \end{aligned}$$

\]

Calculate page B163b right column

\[

$$\begin{aligned} (14)\quad &216 - 21 = 195 \\ (15)\quad &216 - 41 = 175 \\ (16)\quad &216 - 62 = 154 \\ (17)\quad &216 - 82 = 134 \\ (18)\quad &216 - 93 = 123 \end{aligned}$$

\]

Calculate page B164a left and right columns

\[

$$\begin{aligned} (1)\quad &144 - 16 = 128 \\ (2)\quad &144 - 18 = 126 \\ (3)\quad &144 - 17 = 127 \\ (4)\quad &144 - 19 = 125 \\ (5)\quad &144 - 61 = 83 \\ (6)\quad &144 - 81 = 63 \\ (7)\quad &144 - 71 = 73 \\ (8)\quad &144 - 91 = 53 \end{aligned}$$

\]
</reasoning>

<answer>

No.	Problem	Answer
(10)	\(126 - 31\)	\(95\)
(11)	\(126 - 51\)	\(75\)
(12)	\(126 - 72\)	\(54\)
(13)	\(126 - 92\)	\(34\)
(14)	\(216 - 21\)	\(195\)
(15)	\(216 - 41\)	\(175\)
(16)	\(216 - 62\)	\(154\)
(17)	\(216 - 82\)	\(134\)
(18)	\(216 - 93\)	\(123\)
(1)	\(144 - 16\)	\(128\)
(2)	\(144 - 18\)	\(126\)
(3)	\(144 - 17\)	\(127\)
(4)	\(144 - 19\)	\(125\)
(5)	\(144 - 61\)	\(83\)
(6)	\(144 - 81\)	\(63\)
(7)	\(144 - 71\)	\(73\)
(8)	\(144 - 91\)	\(53\)

</answer>

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