Real-World Examples of Estimating Products in Grade 4

📚 Quick Study Guide

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• Estimating is finding a number that is close to the exact answer.
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• When estimating sums (adding), round each number to the nearest ten, hundred, or thousand. Then add the rounded numbers.
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• When estimating differences (subtracting), round each number to the nearest ten, hundred, or thousand. Then subtract the rounded numbers.
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• Real-world examples include estimating the cost of groceries or the number of items in a jar.
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• Look for keywords like 'about,' 'approximately,' or 'close to' in word problems. These signal that you need to estimate.
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• Estimating helps you check if your exact answer is reasonable.
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• Practice makes perfect! The more you estimate, the better you become at it.

Practice Quiz

1. What is the estimated sum of 47 + 23 when rounded to the nearest ten?
   1. A) 60
   2. B) 70
   3. C) 80
   4. D) 90
2. A bag of chips costs $2.85 and a drink costs $1.15. About how much will it cost in total?
   1. A) $3
   2. B) $4
   3. C) $5
   4. D) $6
3. Estimate the difference between 82 and 39 when rounded to the nearest ten.
   1. A) 30
   2. B) 40
   3. C) 50
   4. D) 60
4. You have 68 stickers, and you give 22 to a friend. Approximately how many stickers do you have left?
   1. A) 30
   2. B) 40
   3. C) 50
   4. D) 90
5. What is the estimated sum of 152 + 248 when rounded to the nearest hundred?
   1. A) 300
   2. B) 400
   3. C) 500
   4. D) 600
6. A book has 312 pages, and you've read 189. About how many pages are left to read?
   1. A) 100
   2. B) 200
   3. C) 300
   4. D) 400
7. Estimate the total cost of 3 items priced at $5.25, $2.75, and $1.90, rounding to the nearest dollar.
   1. A) $7
   2. B) $8
   3. C) $9
   4. D) $10