CCSS 4.NF.3A Sort By Grade Worksheets

CCSS 4.NF.3A (Common Core, 4th Grade): "Understand addition and subtraction of fractions as joining and separating parts referring to the same whole." The worksheets below practice this standard. Each one is a free printable PDF with an answer key, comes in multiple versions, and can also be assigned digitally - no login or account needed.

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Number and Operations—Fractions Build fractions from unit fractions by applying and extending previous understandings of operations on whole numbers. 3Understand a fraction a/b with a > 1 as a sum of fractions 1/b. aUnderstand addition and subtraction of fractions as joining and separating parts referring to the same whole.

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Adding Fractions Visual (combining)

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• Add two fractions by combining their parts to make a total amount.
• Use pictures or fraction models to see what each fraction means before adding.

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Decomposing Fractions into Sums with Like Denominators

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• Decompose a fraction into a sum of fractions with the same denominator.
• Find a missing part when a fraction is written as a sum of smaller fractions.
• Understand that the numerators of the parts add up to the numerator of the whole.