For example, the weight of an apple is 3/4 of that of a pear, so the weight of the pear is regarded as "1 whole", and then it is divided into four parts on average, so the weight of an apple is equivalent to three parts.

For example, it takes 12 days for Party A to complete a project alone, while it takes 6 days for Party B to complete a project alone. If we regard this project as "1 whole" and divide it into 12 parts on average, then the daily completion of Party A is equivalent to 1 part of this project1part, that is, the daily completion of Party A accounts for this project.

At this time, you can tell the students: (You can write it on the blackboard in several lines, which makes it easier to see one-to-one correspondence)

all

"A is the score of B."

"How much does A account for B?"

"What is the ratio of A to B?"

The objects behind "Yes", "Zhan" and "Bi" are all regarded as "1 whole".

Don't say the unit "1", it's too abstract. There is no unit at all.