Estimating Difference

Examples, solutions, videos, stories, and songs to teach Grade 3 students how to estimate difference.

The following diagram shows how to decompose fractions using area models to show equivalence. Scroll down the page for more examples and solutions.

 

Estimating Sums and Differences

1. 745 + 386
2. 9,341 + 5,871
3. 431 - 261
4. 6,482 - 3,102

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Estimating Sums and Differences

1. Billy has 17 toy cars. Jordan has 31 toy cars. What is a good estimate for the number of toy cars both boys have?
2. This morning the donut shop sold 376 sugar donuts and 514 glazed donuts. Approximately how many donuts were sold?
3. Casey and Fred scored 586 points on a vidoe game. Jason and Stacey scored 123 less points. What is a good estimate of how many points Jason and Stacey scored when rounded to the nearest 10.

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Estimating Addition and Subtraction Problems
This video explains how to round whole numbers to estimate addition and subtraction problems.

1. Estimate the sum by rounding to the tens:
   34 + 73
2. Estimate the difference by rounding to the thousands
   14,389 - 6,846
3. Estimate the difference by rounding to the ten thousands
   7,004,585 + 86,942
4. Estimate the difference by rounding to the thousands
   89,489 - 23,892

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