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

• Comparing two different pizzas

4.NF.B.3. Understand a fraction $a/b$ with $a > 1$ as a sum of fractions $1/b$.

• Writing a Mixed Number as an Equivalent Fraction

4.NF.B.3.a. Understand addition and subtraction of fractions as joining and separating parts referring to the same whole.

• Comparing Sums of Unit Fractions

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: $\frac38 = \frac18 + \frac18 + \frac18$; $\frac38 = \frac18 + \frac28$; $2 \frac18 = 1 + 1 + \frac18 = \frac88 + \frac88 + \frac18.$

• Making 22 Seventeenths in Different Ways

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.

• Cynthia's Perfect Punch
• Peaches
• Plastic Building Blocks
• Writing a Mixed Number as an Equivalent Fraction

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.

• No tasks yet illustrate this standard.

4.NF.B.4. Apply and extend previous understandings of multiplication to multiply a fraction by a whole number.

• Extending Multiplication From Whole Numbers to Fractions

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 $5 \times (1/4)$, recording the conclusion by the equation $5/4 = 5 \times (1/4).$

• No tasks yet illustrate this 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 $3 \times (2/5)$ as $6 \times (1/5)$, recognizing this product as $6/5$. (In general, $n \times (a/b) = (n \times a)/b.$)

• No tasks yet illustrate this 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?

• Sugar in six cans of soda