# Domain 4.NF, Number and Operations—Fractions

## Cluster 4.NF.A, Extend understanding of fraction equivalence and ordering.

Major Cluster

### Standard 4.NF.A.1

Explain why a fraction a/b is equivalent to a fraction (n x a)/(n x b) by using visual fraction models, with attention to how the number and size of the parts differ even though the two fractions themselves are the same size. Use this principle to recognize and generate equivalent fractions.

10 Lessons

45 Activities

### Standard 4.NF.A.2

Compare two fractions with different numerators and different denominators, e.g., by creating common denominators or numerators, or by comparing to a benchmark fraction such as 1/2. Recognize that comparisons are valid only when the two fractions refer to the same whole. Record the results of comparisons with symbols >, =, or <

15 Lessons

27 Activities

## Cluster 4.NF.B, Build fractions from unit fractions by applying and extending previous understandings of operations on whole numbers.

Major Cluster

### Standard 4.NF.B.3

Understand a fraction a/b with a > 1 as a sum of fractions 1/b.

31 Lessons

84 Activities

### Standard 4.NF.B.3.A

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

13 Lessons

26 Activities

### Standard 4.NF.B.3.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, e.g., by using a visual fraction model. Examples: 3/8 = 1/8 + 1/8 + 1/8 ; 3/8 = 1/8 + 2/8 ; 2 1/8 = 1 + 1 + 1/8 = 8/8 + 8/8 + 1/8.

17 Lessons

34 Activities

### Standard 4.NF.B.3.C

Add and subtract mixed numbers with like denominators, e.g., by replacing each mixed number with an equivalent fraction, and/or by using properties of operations and the relationship between addition and subtraction.

13 Lessons

20 Activities

### Standard 4.NF.B.3.D

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

8 Lessons

13 Activities

### Standard 4.NF.B.4

Apply and extend previous understandings of multiplication to multiply a fraction by a whole number.

15 Lessons

32 Activities

### Standard 4.NF.B.4.A

Understand a fraction a/b as a multiple of 1/b. For example, use a visual fraction model to represent 5/4 as the product 5 x (1/4), recording the conclusion by the equation 5/4 = 5 x (1/4).

11 Lessons

10 Activities

### Standard 4.NF.B.4.B

Understand a multiple of a/b as a multiple of 1/b, and use this understanding to multiply a fraction by a whole number. For example, use a visual fraction model to express 3 x (2/5) as 6 x (1/5), recognizing this product as 6/5. (In general, n x (a/b) = (n x a)/b.)

4 Lessons

17 Activities

### Standard 4.NF.B.4.C

Solve word problems involving multiplication of a fraction by a whole number, e.g., by using visual fraction models and equations to represent the problem. For example, if each person at a party will eat 3/8 of a pound of roast beef, and there will be 5 people at the party, how many pounds of roast beef will be needed? Between what two whole numbers does your answer lie?

4 Lessons

12 Activities

## Cluster 4.NF.C, Understand decimal notation for fractions, and compare decimal fractions.

Major Cluster

### Standard 4.NF.C.5

Express a fraction with denominator 10 as an equivalent fraction with denominator 100, and use this technique to add two fractions with respective denominators 10 and 100.2 For example, express 3/10 as 30/100, and add 3/10 + 4/100 = 34/100.

11 Lessons

30 Activities

### Standard 4.NF.C.6

Use decimal notation for fractions with denominators 10 or 100. For example, rewrite 0.62 as 62/100; describe a length as 0.62 meters; locate 0.62 on a number line diagram.

8 Lessons

28 Activities

### Standard 4.NF.C.7

Compare two decimals to hundredths by reasoning about their size. Recognize that comparisons are valid only when the two decimals refer to the same whole. Record the results of comparisons with the symbols >, =, or

5 Lessons

14 Activities