Score:

The first and second terms of the ratio are multiplied by the least common multiple of these two denominators at the same time, and then divided by their common factor according to the topic.

Decimal system:

Move the decimal points of the first term and the second term of the ratio to the right by the same number of digits at the same time until they become positive numbers, and then divide them by their common factors at the same time according to the topic to simplify.

Method:

Mainly depends on which quantity is the ratio of which quantity and what quantity is being done. This must be remembered, because I made such a mistake, and the good 100 is gone.

Also note that a ratio can be written in the form of division and fraction, and you should learn to be comprehensive and timely when doing the problem.