Final answer:
To estimate the length of a door using 12-inch rulers, you would need approximately 6.5 to 7 rulers, since a standard door is about 80 inches tall and 80 divided by 12 is roughly 6.67.
Step-by-step explanation:
Estimating the Length of an Object in Feet
When trying to figure out the length of a door using 12-inch rulers, we begin by imagining how many of those rulers lined up end to end would match the height of the door. A standard door in the United States is usually about 80 inches tall. Since each ruler is one foot long (12 inches), it would take approximately 6.5 to 7 rulers to be about the same length as a standard door. This is because 80 divided by 12 gives us about 6.67, which we can round up to 7 for estimating purposes.