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Lesson Plans and Worksheets for Grade 4

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More Lessons for Grade 4

Common Core For Grade 4

Examples, solutions, and videos to help Grade 4 students learn how to estimate sums and differences using benchmark numbers.

Topic F: Addition and Subtraction of Fractions by Decomposition

Common Core Standards: 4.NF.3c, 4.NF.3d, 4.MD.4, 4.MD.2

Lesson 29 Concept Development

Problem 1: Estimate the sum or difference of two mixed numbers by rounding each fraction.

Problem 2: Round two mixed numbers to the nearest half or whole, and then find the sum.

Problem 3: Estimate the difference of two fractions greater than 1.

Problem 4: Use benchmark numbers or mental math to estimate the sum and difference of two mixed numbers.

Lesson 29 Problem Set

- Estimate each sum or difference to the nearest whole or half by rounding. Explain your estimate using words or a number line.
- Estimate each sum or difference to the nearest whole or half by rounding. Explain your estimate using words or a number line.(Improper fractions)
- Montoya’s estimate for 8 5/8 - 2 1/6 was 7. Julio’s estimate was 6 1/2. Whose estimate do you think is closer to the actual difference? Explain.
- Use benchmark numbers or mental math to estimate the sum or difference.

Lesson 29 Homework

- Estimate each sum or difference to the nearest whole or half by rounding. Explain your estimate using words or a number line.
- Estimate each sum or difference to the nearest whole or half by rounding. Explain your estimate using words or a number line.
- Gina’s estimate for 7 5/8 - 2 1/2 was . Dominick’s estimate was 5 1/2. Whose estimate do you think is closer to the actual difference? Explain.
- Use benchmark numbers or mental math to estimate the sum or difference.

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