You're working on
“Sweet Estimation” — a math worksheet where you estimate the sum of two numbers by rounding each to the nearest hundred, then adding the rounded numbers.
Let’s solve each problem step-by-step.
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🔢 How to Round to the Nearest Hundred:
- Look at the
tens digit (the second digit from the right).
- If it’s
5 or more, round
up.
- If it’s
4 or less, round
down.
- Example: 189 → tens digit is 8 → round up to
200
---
##
✔ Solutions:
---
Row 1
1. 189 + 334
- 189 → 200 (8 ≥ 5 → round up)
- 334 → 300 (3 < 5 → round down)
- Estimate:
200 + 300 = 500
2. 441 + 323
- 441 → 400 (4 < 5 → round down)
- 323 → 300 (2 < 5 → round down)
- Estimate:
400 + 300 = 700
3. 252 + 368
- 252 → 300 (5 ≥ 5 → round up)
- 368 → 400 (6 ≥ 5 → round up)
- Estimate:
300 + 400 = 700
---
Row 2
4. 363 + 429
- 363 → 400 (6 ≥ 5 → round up)
- 429 → 400 (2 < 5 → round down)
- Estimate:
400 + 400 = 800
5. 598 + 176
- 598 → 600 (9 ≥ 5 → round up)
- 176 → 200 (7 ≥ 5 → round up)
- Estimate:
600 + 200 = 800
6. 625 + 238
- 625 → 600 (2 < 5 → round down) ← *Wait! Tens digit is 2? Actually, 625 → tens digit is 2? No — let's check:*
- 625: hundreds = 600, tens = 2 → 2 < 5 → round down →
600
- 238 → 200 (3 < 5 → round down)
- Estimate:
600 + 200 = 800
✔ Correction: Yes, 625 rounds to 600 (since 2 in tens place < 5)
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Row 3
7. 324 + 150
- 324 → 300 (2 < 5 → round down)
- 150 → 200 (5 ≥ 5 → round up)
- Estimate:
300 + 200 = 500
8. 716 + 202
- 716 → 700 (1 < 5 → round down)
- 202 → 200 (0 < 5 → round down)
- Estimate:
700 + 200 = 900
9. 137 + 381
- 137 → 100 (3 < 5 → round down)
- 381 → 400 (8 ≥ 5 → round up)
- Estimate:
100 + 400 = 500
---
Row 4
10. 681 + 99
- 681 → 700 (8 ≥ 5 → round up)
- 99 → 100 (9 ≥ 5 → round up)
- Estimate:
700 + 100 = 800
11. 528 + 145
- 528 → 500 (2 < 5 → round down)
- 145 → 100 (4 < 5 → round down)
- Estimate:
500 + 100 = 600
12. 848 + 136
- 848 → 800 (4 < 5 → round down)
- 136 → 100 (3 < 5 → round down)
- Estimate:
800 + 100 = 900
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## 📝 Final Answers (to write in the blanks):
```
189 → 200 441 → 400 252 → 300
+334 → 300 +323 → 300 +368 → 400
= 500 = 700 = 700
363 → 400 598 → 600 625 → 600
+429 → 400 +176 → 200 +238 → 200
= 800 = 800 = 800
324 → 300 716 → 700 137 → 100
+150 → 200 +202 → 200 +381 → 400
= 500 = 900 = 500
681 → 700 528 → 500 848 → 800
+99 → 100 +145 → 100 +136 → 100
= 800 = 600 = 900
```
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✔ You’re all set! This helps build number sense and quick mental math skills. Great job estimating! 🍬
Parent Tip: Review the logic above to help your child master the concept of place value rounding worksheet 3rd grade.
