Let's solve each of these
estimation word problems by
rounding each number to the nearest hundred, then performing the required operation (addition or subtraction). We'll go step by step.
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1) There are 4,162 walnut trees currently in the park. Park workers will plant 6,786 more walnut trees today. Estimate how many walnut trees will be in the park when the workers are finished.
- Round 4,162 →
4,200
- Round 6,786 →
6,800
- Add: 4,200 + 6,800 =
11,000
✔ Answer: 11,000
---
2) Dan scored 6,776 points on the video game and Benny scored 2,372 points. Estimate how many points they scored together.
- Round 6,776 →
6,800
- Round 2,372 →
2,400
- Add: 6,800 + 2,400 =
9,200
✔ Answer: 9,200
---
3) Alyssa has 6,526 Pokemon cards. Mike bought 4,156 of Alyssa's baseball cards. Estimate how many Pokemon cards Alyssa still owns.
> Note: This says "baseball cards", but she has "Pokemon cards". Assuming it’s a typo and we're subtracting from her Pokemon collection.
- Round 6,526 →
6,500
- Round 4,156 →
4,200
- Subtract: 6,500 - 4,200 =
2,300
✔ Answer: 2,300
---
4) Sally picked 4,566 limes and Dan picked 5,155 limes from the orchard. Estimate how many limes they picked together.
- Round 4,566 →
4,600
- Round 5,155 →
5,200
- Add: 4,600 + 5,200 =
9,800
✔ Answer: 9,800
---
5) Mike had 7,844 quarters in his bank. He spent 2,257 of his quarters. Estimate how many quarters he now has in his bank.
- Round 7,844 →
7,800
- Round 2,257 →
2,300
- Subtract: 7,800 - 2,300 =
5,500
✔ Answer: 5,500
---
6) Jason and Dan both collect marbles. Jason has collected 9,114 and Dan has collected 3,821 marbles. Estimate how many marbles they own together.
- Round 9,114 →
9,100
- Round 3,821 →
3,800
- Add: 9,100 + 3,800 =
12,900
✔ Answer: 12,900
---
7) Keith owns 1,699 books and Benny owns 3,835 books. Estimate how many books they have together.
- Round 1,699 →
1,700
- Round 3,835 →
3,800
- Add: 1,700 + 3,800 =
5,500
✔ Answer: 5,500
---
8) The post office mails 9,618 letters each day, out of which 2,193 are addressed to foreign countries. Estimate the number of letters that are sent domestically.
- Round 9,618 →
9,600
- Round 2,193 →
2,200
- Subtract: 9,600 - 2,200 =
7,400
✔ Answer: 7,400
---
9) Jessica is reading a book that contains 7,574 pages. She has read 1,433 pages. Estimate how many pages are unread.
- Round 7,574 →
7,600
- Round 1,433 →
1,400
- Subtract: 7,600 - 1,400 =
6,200
✔ Answer: 6,200
---
10) Sally's school sold 6,517 boxes of doughnuts for a fundraiser this year. She sold 3,294 boxes. Estimate how many boxes were sold by the rest of the students.
- Round 6,517 →
6,500
- Round 3,294 →
3,300
- Subtract: 6,500 - 3,300 =
3,200
✔ Answer: 3,200
---
✔ Final Answers (Rounded to Nearest Hundred):
1)
11,000
2)
9,200
3)
2,300
4)
9,800
5)
5,500
6)
12,900
7)
5,500
8)
7,400
9)
6,200
10)
3,200
---
🔍 Explanation:
For each problem, we followed these steps:
1.
Round each number to the nearest hundred.
- Look at the tens digit: if it's 5 or more, round up; otherwise, round down.
2.
Perform the required operation (addition or subtraction).
3.
Write the estimated result.
This method gives a quick and reasonable approximation, useful in real-life situations where exact numbers aren't necessary.
Let me know if you'd like a printable version or a worksheet with answers!
Parent Tip: Review the logic above to help your child master the concept of rounding word problems worksheet.
