Estimation Worksheets | Dynamically Created Estimation Worksheets ... - Free Printable

Let's solve each of these estimation word problems by rounding each number to the nearest ten, then performing the required operation (addition or subtraction). I'll go step by step and explain each one.

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1) There are 219 pencils in the drawer. Joan placed 237 more pencils in the drawer. Estimate how many pencils are now in the drawer.

- Round 219 → 220
- Round 237 → 240
- Add: 220 + 240 = 460

✔ Answer: 460

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2) Sam picked 639 apples and Tim picked 947 apples from the apple tree. Estimate how many apples they picked together.

- Round 639 → 640
- Round 947 → 950
- Add: 640 + 950 = 1,590

✔ Answer: 1,590

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3) Mike grew 886 cantelopes. Sandy grew 372 cantelopes. Estimate how many cantelopes did they grow in total?

- Round 886 → 890
- Round 372 → 370
- Add: 890 + 370 = 1,260

✔ Answer: 1,260

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4) There are 159 popular trees currently in the park. Park workers will plant 714 more popular trees today. Estimate how many popular trees will be in the park when the workers are finished.

- Round 159 → 160
- Round 714 → 710
- Add: 160 + 710 = 870

✔ Answer: 870

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5) Jessica owns 782 books and Keith owns 191 books. Estimate how many books they have together.

- Round 782 → 780
- Round 191 → 190
- Add: 780 + 190 = 970

✔ Answer: 970

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6) Benny has 567 green balloons; he gave Sandy 259 of the balloons. Estimate how many green balloons he now owns.

- Round 567 → 570
- Round 259 → 260
- Subtract: 570 - 260 = 310

✔ Answer: 310

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7) Tim found 542 seashells on the beach, he gave Jessica 334 of the seashells. Estimate how many seashells he now has.

- Round 542 → 540
- Round 334 → 330
- Subtract: 540 - 330 = 210

✔ Answer: 210

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8) Jason has 525 baseball cards. Benny bought 221 of Jason's baseball cards. Estimate how many baseball cards Jason still owns.

- Round 525 → 530
- Round 221 → 220
- Subtract: 530 - 220 = 310

✔ Answer: 310

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9) Dan's school sold 651 boxes of doughnuts for a fundraiser this year. He sold 133 boxes. Estimate how many boxes were sold by the rest of the students.

- Round 651 → 650
- Round 133 → 130
- Subtract: 650 - 130 = 520

✔ Answer: 520

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10) Benny had 714 quarters in his bank. He spent 286 of his quarters. Estimate how many quarters he now has in his bank.

- Round 714 → 710
- Round 286 → 290
- Subtract: 710 - 290 = 420

✔ Answer: 420

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✔ Final Answers:

| Problem | Answer |
|--------|--------|
| 1 | 460 |
| 2 | 1,590 |
| 3 | 1,260 |
| 4 | 870 |
| 5 | 970 |
| 6 | 310 |
| 7 | 210 |
| 8 | 310 |
| 9 | 520 |
| 10 | 420 |

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🔍 Summary:

We rounded each number to the nearest ten, then added or subtracted as needed. This method gives a quick estimate that’s close to the actual answer — useful for checking reasonableness of exact calculations.

Let me know if you'd like the exact answers too for comparison!