Question

write the missing sign (+, - or =) in each number sentence.

1. 6 ____ 3 = 9
2. 12 ____ 6 = 6
3. 4 ____ 2 = 2
4. 4 + 3 ____ 7
5. 14 ____ 1 = 15
6. 12 ____ 2 = 10
7. 9 ____ 3 = 6
8. 14 ____ 4 = 10
9. 14 - 7 ____ 7
10. 4 ____ 1 = 3
11. 7 - 3 ____ 4
12. 3 ____ 3 = 6
13. 8 ____ 4 = 12
14. 9 ____ 2 = 11
15. 11 ____ 2 = 9

write an addition equation to find the total number of items.
16.
5 + 5 + 5 + 5 = 20
17.
____________________
18.
____________________
19.
____________________

Explanation:

<pre_analysis>
{
"quality": "clear",
"question_count": 18,
"skills_matched": [
"step_cot",
"table_formatter",
"explain_then_answer",
"quick"
],
"needs_drawing": false,
"concepts_used": [],
"new_concepts": [
"Addition and Subtraction",
"Repeated Addition"
],
"current_concepts": [
"Addition and Subtraction",
"Repeated Addition"
]
}
</pre_analysis>

<reasoning>

Solve missing signs (Questions 1-15)

Determine the operator \(+\), \(-\), or \(=\) that makes each number sentence true:

1. \(6 \ \underline{+} \ 3 = 9\)
2. \(12 \ \underline{-} \ 6 = 6\)
3. \(4 \ \underline{-} \ 2 = 2\)
4. \(4 + 3 \ \underline{=} \ 7\)
5. \(14 \ \underline{+} \ 1 = 15\)
6. \(12 \ \underline{-} \ 2 = 10\)
7. \(9 \ \underline{-} \ 3 = 6\)
8. \(14 \ \underline{-} \ 4 = 10\)
9. \(14 - 7 \ \underline{=} \ 7\)
10. \(4 \ \underline{-} \ 1 = 3\)
11. \(7 - 3 \ \underline{=} \ 4\)
12. \(3 \ \underline{+} \ 3 = 6\)
13. \(8 \ \underline{+} \ 4 = 12\)
14. \(9 \ \underline{+} \ 2 = 11\)
15. \(11 \ \underline{-} \ 2 = 9\)

Solve addition equations for items (Questions 16-19)

Write repeated addition equations based on the groups of items:

• 16. Already solved in the image: 4 rows of 5 dinosaurs: \(5 + 5 + 5 + 5 = 20\)
• 17. 5 rows of 3 elephants: \(3 + 3 + 3 + 3 + 3 = 15\)
• 18. 4 rows of 4 camels (grouped as 2 pairs of 2 in each row): \(4 + 4 + 4 + 4 = 16\)
• 19. 3 rows of 8 turtles: \(8 + 8 + 8 = 24\)

</reasoning>

<answer>

No.	Answer
2	\(-\)
3	\(-\)
4	\(=\)
5	\(+\)
6	\(-\)
7	\(-\)
8	\(-\)
9	\(=\)
10	\(-\)
11	\(=\)
12	\(+\)
13	\(+\)
14	\(+\)
15	\(-\)
16	\(5 + 5 + 5 + 5 = 20\)
17	\(3 + 3 + 3 + 3 + 3 = 15\)
18	\(4 + 4 + 4 + 4 = 16\)
19	\(8 + 8 + 8 = 24\)

</answer>

<post_analysis>
{
"subject": "Mathematics",
"question_type": "Multi-part",
"knowledge_point": [
"Mathematics",
"Algebra",
"Addition and 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": [],
"new_concepts": [
"Addition and Subtraction",
"Repeated Addition"
],
"current_concepts": [
"Addition and Subtraction",
"Repeated Addition"
]
}
</pre_analysis>

<reasoning>

Solve missing signs (Questions 1-15)

Determine the operator \(+\), \(-\), or \(=\) that makes each number sentence true:

1. \(6 \ \underline{+} \ 3 = 9\)
2. \(12 \ \underline{-} \ 6 = 6\)
3. \(4 \ \underline{-} \ 2 = 2\)
4. \(4 + 3 \ \underline{=} \ 7\)
5. \(14 \ \underline{+} \ 1 = 15\)
6. \(12 \ \underline{-} \ 2 = 10\)
7. \(9 \ \underline{-} \ 3 = 6\)
8. \(14 \ \underline{-} \ 4 = 10\)
9. \(14 - 7 \ \underline{=} \ 7\)
10. \(4 \ \underline{-} \ 1 = 3\)
11. \(7 - 3 \ \underline{=} \ 4\)
12. \(3 \ \underline{+} \ 3 = 6\)
13. \(8 \ \underline{+} \ 4 = 12\)
14. \(9 \ \underline{+} \ 2 = 11\)
15. \(11 \ \underline{-} \ 2 = 9\)

Solve addition equations for items (Questions 16-19)

Write repeated addition equations based on the groups of items:

• 16. Already solved in the image: 4 rows of 5 dinosaurs: \(5 + 5 + 5 + 5 = 20\)
• 17. 5 rows of 3 elephants: \(3 + 3 + 3 + 3 + 3 = 15\)
• 18. 4 rows of 4 camels (grouped as 2 pairs of 2 in each row): \(4 + 4 + 4 + 4 = 16\)
• 19. 3 rows of 8 turtles: \(8 + 8 + 8 = 24\)

</reasoning>

<answer>

No.	Answer
2	\(-\)
3	\(-\)
4	\(=\)
5	\(+\)
6	\(-\)
7	\(-\)
8	\(-\)
9	\(=\)
10	\(-\)
11	\(=\)
12	\(+\)
13	\(+\)
14	\(+\)
15	\(-\)
16	\(5 + 5 + 5 + 5 = 20\)
17	\(3 + 3 + 3 + 3 + 3 = 15\)
18	\(4 + 4 + 4 + 4 = 16\)
19	\(8 + 8 + 8 = 24\)

</answer>

<post_analysis>
{
"subject": "Mathematics",
"question_type": "Multi-part",
"knowledge_point": [
"Mathematics",
"Algebra",
"Addition and Subtraction"
]
}
</post_analysis>