Sure! Let’s solve each problem step by step. The goal is to
write each number in standard form — that means writing it as a regular number (like 2,437), not as expanded form or words.
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🔢 1. 3,000 + 500 + 70 + 9
Add them together:
- 3,000
- + 500 → 3,500
- + 70 → 3,570
- + 9 →
3,579
✔ Answer: 3,579
---
🔢 2. 8,000 + 400 + 3
Add them:
- 8,000
- + 400 → 8,400
- + 3 →
8,403
✔ Answer: 8,403
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🔢 3. 1,000 + 200 + 80 + 6
Add them:
- 1,000
- + 200 → 1,200
- + 80 → 1,280
- + 6 →
1,286
✔ Answer: 1,286
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🔢 4. 7,000 + 900 + 10
Add them:
- 7,000
- + 900 → 7,900
- + 10 →
7,910
✔ Answer: 7,910
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📝 5. two thousand, one hundred thirty-eight
Break it down:
- “two thousand” = 2,000
- “one hundred” = 100
- “thirty-eight” = 38
Add: 2,000 + 100 + 38 =
2,138
✔ Answer: 2,138
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📝 6. five thousand, eight hundred seven
Break it down:
- “five thousand” = 5,000
- “eight hundred” = 800
- “seven” = 7
Add: 5,000 + 800 + 7 =
5,807
✔ Answer: 5,807
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📝 7. nine thousand, fifty
Break it down:
- “nine thousand” = 9,000
- “fifty” = 50
Note: There are
no hundreds or ones, so we write 0s in those places.
So: 9,000 + 50 =
9,050
✔ Answer: 9,050
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📝 8. four thousand, two
Break it down:
- “four thousand” = 4,000
- “two” = 2
No hundreds or tens → fill with zeros.
So: 4,000 + 2 =
4,002
✔ Answer: 4,002
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##
✔ Final Answers:
1.
3,579
2.
8,403
3.
1,286
4.
7,910
5.
2,138
6.
5,807
7.
9,050
8.
4,002
Let me know if you’d like to practice reading these numbers aloud too! 😊
Parent Tip: Review the logic above to help your child master the concept of standard form worksheet 3rd grade.
