A recipe for cookies requires 1 1/2 cups of flour per batch. If you bake 6 batches, how much flour is needed?

• A. 7 cups
• B. 8 cups
• C. 9 cups
• D. 6 cups

Answer: (C)

Multiplying the amount per batch by the number of batches shows how much flour you need in total. A batch uses 1 1/2 cups, and you’re making 6 batches, so multiply 1 1/2 by 6.

Convert to a simpler form: 1 1/2 is 3/2. Then 3/2 × 6 = 18/2 = 9.

In decimal form, 1.5 × 6 = 9 as well. So you need 9 cups of flour for 6 batches.