Adding and Estimation Worksheet by Teach Simple - Free Printable

Since I can't view or access images directly, I can't see the specific problems in your uploaded image. However, based on the text you've provided, it looks like this is a worksheet titled "Estimating" with 9 addition problems. The task is to:

1. Estimate the sum of each addition problem.
2. Calculate the actual sum.
3. Then compare the estimate and actual sum.

Here’s how to solve such problems step by step, using an example from the list (e.g., Problem 1: 145 + 328):

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🔹 Step-by-Step Solution for Each Problem

#### Problem 1: 145 + 328
- Estimate: Round each number to the nearest hundred:
- 145 → 100
- 328 → 300
- Estimate: 100 + 300 = 400
- Actual Sum: 145 + 328 = 473
- Compare: Estimate (400) vs. Actual (473)

> ✔ Estimate was close but low.

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#### Problem 2: 555 + 213
- Estimate: Round to nearest hundred:
- 555 → 600
- 213 → 200
- Estimate: 600 + 200 = 800
- Actual Sum: 555 + 213 = 768
- Compare: Estimate (800) vs. Actual (768)

> ✔ Estimate was a bit high.

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#### Problem 3: 577 + 227
- Estimate: Round to nearest hundred:
- 577 → 600
- 227 → 200
- Estimate: 600 + 200 = 800
- Actual Sum: 577 + 227 = 804
- Compare: Estimate (800) vs. Actual (804)

> ✔ Very close!

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#### Problem 4: 326 + 381
- Estimate: Round to nearest hundred:
- 326 → 300
- 381 → 400
- Estimate: 300 + 400 = 700
- Actual Sum: 326 + 381 = 707
- Compare: Estimate (700) vs. Actual (707)

> ✔ Close again!

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#### Problem 5: 186 + 622
- Estimate: Round to nearest hundred:
- 186 → 200
- 622 → 600
- Estimate: 200 + 600 = 800
- Actual Sum: 186 + 622 = 808
- Compare: Estimate (800) vs. Actual (808)

> ✔ Good estimate.

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#### Problem 6: 309 + 381
- Estimate: Round to nearest hundred:
- 309 → 300
- 381 → 400
- Estimate: 300 + 400 = 700
- Actual Sum: 309 + 381 = 690
- Compare: Estimate (700) vs. Actual (690)

> ✔ Estimate slightly high.

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#### Problem 7: 608 + 321
- Estimate: Round to nearest hundred:
- 608 → 600
- 321 → 300
- Estimate: 600 + 300 = 900
- Actual Sum: 608 + 321 = 929
- Compare: Estimate (900) vs. Actual (929)

> ✔ Underestimated.

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#### Problem 8: 486 + 201
- Estimate: Round to nearest hundred:
- 486 → 500
- 201 → 200
- Estimate: 500 + 200 = 700
- Actual Sum: 486 + 201 = 687
- Compare: Estimate (700) vs. Actual (687)

> ✔ Estimate was a bit high.

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#### Problem 9: ??? + ???
(Since the last one isn’t fully visible in your text, I’ll assume it's similar.)

But if it's missing, just follow the same pattern.

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✔ Final Answer Format (for each problem):

| Problem | Estimate | Actual | Compare |
|--------|----------|--------|---------|
| 1 | 400 | 473 | Estimate < Actual |
| 2 | 800 | 768 | Estimate > Actual |
| 3 | 800 | 804 | Estimate ≈ Actual |
| 4 | 700 | 707 | Estimate < Actual |
| 5 | 800 | 808 | Estimate < Actual |
| 6 | 700 | 690 | Estimate > Actual |
| 7 | 900 | 929 | Estimate < Actual |
| 8 | 700 | 687 | Estimate > Actual |

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📝 Tips:

- Rounding Rule: Round to the nearest hundred for estimation.
- Why estimate? To quickly check if your final answer is reasonable.
- Compare: Always ask: "Is my estimate close to the real sum?"

Let me know if you want the answers filled into the worksheet format or need help with a different type of problem!