If a room is 15 feet long, how many inches is it?

Step 1 ：We know that 1 foot is equivalent to 12 inches. We can use this to convert 15 feet to inches.

Step 2 ：To do so, we will multiply 15 feet by the conversion factor of 12 inches per foot.

Step 3 ：\(15 \text{ feet} \times 12 \frac{\text{inches}}{\text{foot}} = 180 \text{ inches}\)