Problem Analysis:
The worksheet involves basic addition and filling in missing numbers in a structured format. Let's break it down step by step.
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Part 1: Write the Missing Number
The first section shows a series of number trees where the top number is the sum of the two bottom numbers. We need to fill in the missing numbers.
1.
First Tree:
- Top number: 12
- Bottom numbers: 8 and 4
- Verification: \( 8 + 4 = 12 \) (Correct)
2.
Second Tree:
- Top number: 15
- Bottom numbers: ? and 5
- To find the missing number: \( ? + 5 = 15 \)
\[
? = 15 - 5 = 10
\]
- Missing number: 10
3.
Third Tree:
- Top number: 17
- Bottom numbers: ? and 10
- To find the missing number: \( ? + 10 = 17 \)
\[
? = 17 - 10 = 7
\]
- Missing number: 7
4.
Fourth Tree:
- Top number: 14
- Bottom numbers: ? and 6
- To find the missing number: \( ? + 6 = 14 \)
\[
? = 14 - 6 = 8
\]
- Missing number: 8
5.
Fifth Tree:
- Top number: 11
- Bottom numbers: ? and 3
- To find the missing number: \( ? + 3 = 11 \)
\[
? = 11 - 3 = 8
\]
- Missing number: 8
6.
Sixth Tree:
- Top number: 20
- Bottom numbers: 12 and ?
- To find the missing number: \( 12 + ? = 20 \)
\[
? = 20 - 12 = 8
\]
- Missing number: 8
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Part 2: Addition Using Pictures
The second section involves simple addition problems with visual aids (pumpkins).
1.
First Problem: 4 + 4
- There are 4 pumpkins in the first row and 4 pumpkins in the second row.
- Total: \( 4 + 4 = 8 \)
- Answer: 8
2.
Second Problem: 3 + 3
- There are 3 pumpkins in the first row and 3 pumpkins in the second row.
- Total: \( 3 + 3 = 6 \)
- Answer: 6
3.
Third Problem: 5 + 2
- There are 5 pumpkins in the first row and 2 pumpkins in the second row.
- Total: \( 5 + 2 = 7 \)
- Answer: 7
4.
Fourth Problem: 5 + 5
- There are 5 pumpkins in the first row and 5 pumpkins in the second row.
- Total: \( 5 + 5 = 10 \)
- Answer: 10
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Final Answers:
1. Missing numbers in the trees:
- Second tree: 10
- Third tree: 7
- Fourth tree: 8
- Fifth tree: 8
- Sixth tree: 8
2. Addition answers:
- \( 4 + 4 = 8 \)
- \( 3 + 3 = 6 \)
- \( 5 + 2 = 7 \)
- \( 5 + 5 = 10 \)
Boxed Final Answer:
\[
\boxed{10, 7, 8, 8, 8, 8, 6, 7, 10}
\]
Parent Tip: Review the logic above to help your child master the concept of 2nd grade number bond worksheet.
