Standard 4.NF.3 – Understanding fractions

Standard 4.NF.3 
Understand a fraction a/b with a >1 as a sum of fractions 1/b. In other words, any fraction is a sum of unit fractions.

A. Understand addition and subtraction of fractions as joining and separating parts referring to the same whole. 

B. Decompose a fraction into a sum of fractions with the same denominator in more than one way, recording each decomposition by an equation. Justify decompositions, for example, by using a visual fraction model. For example, 3/8 = 1/8 + 1/8 + 1/8; 3/8 = 1/8 + 2/8; 2 1/8 = 1 + 1 + 1/8; 2 1/8 = 8/8 + 8/8 + 1/8. 

C. Add and subtract mixed numbers with like denominators, for example, by replacing each mixed number with an equivalent fraction, and/or by using properties of operations and the relationship between addition and subtraction. For example, 3 1/4 + 2 1/4 = 13/4 + 9/4 = 22/4; 3 1/4 + 2 1/4 = (3+ 2) + (1/4 + 1/4) = 5 + 2/4 = 5 2/4, which is equivalent to 22/4. 

D. Solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators, for example, by using visual fraction models and equations to represent the problem. 

Explanation: We are simply teaching how to add fractions with the same denominators. The main things to remember are: Add the numbers across the top (numerators) but do not add the numbers on the bottom (denominators) because the number of parts doesn’t change. Be sure to add correctly. Students should understand how to put fractions on a number line, and count out the parts in a model. Check out the videos below:

Fractions 4.NF.3

https://www.educreations.com/lesson/embed/49368650/?ref=embed

Review for 4.NF.3 c and d Test


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