Question

How are a ruler, a yardstick, and a measuring tape the same? How are they different?

Answer 1

A ruler, yardstick, and measuring tape all measure things.
A difference is a ruler,yardstick, and measuring tape all have different lengths.

I hope this helped :) <3

Answer 2

They all use the metric unit to measure things (e.g. inches, centimeters, etc.)  
As far as I know, I think the difference might be that a yardstick only measures 1 yard. It has 36 inches (which is 3 feet, which is also 1 yard).
A ruler usually is only 12 inches. 
A measuring tape is usually 12 feet.
That's what I know.