Answer:
The simplest way to teach middle school math scale drawings is to use real pictures to relate to each other to explain the concept. For example, scaling a red ball of 1" to a ball of 2" and so on. This will show how the ball increases by size by adding 1" each time.
It would be the last one because 5 columns are shaded and there are 10 columns all together. 50/100= 0.5
Did you know not only people have to respond your question but you can also search it on the internet and find atleast a hint?