Final answer:
Diego needs 2 more cups of sugar to have the 3 cups required for his cookie recipe. A fraction model visualizes the total 3 parts, with 1 part already filled, showing the need for 2 additional parts.
Step-by-step explanation:
Diego is measuring sugar to bake cookies and needs 3 cups of sugar. Since he already has 1 cup, he needs to find out how much more sugar is required. To demonstrate this with a fraction model, imagine a line divided into three equal parts, each part representing 1 cup. Diego has already filled one part. Therefore, he needs to fill the remaining two parts.
To calculate the amount of sugar Diego needs, you subtract the cup he has from the total cups required:
3 cups (total needed) - 1 cup (already has) = 2 cups (still needed)
Hence, Diego needs 2 more cups of sugar to have the 3 cups required for his cookie recipe.