What does it mean to deduct a point backwards in mathematics?

Deducting one point is to subtract 1 point on the basis of no score (that is, 0 point) in this question.

Some exams are graded correctly, without scoring 0, and points are deducted for wrong answers. The main purpose is to reduce the ambiguity and guess as much as possible, and to test the respondents' real mastery of the exam content.

Seven basic mathematical formulas

Mathematics judgment questions in the fifth grade of primary school

What is the content of Yunnan college entrance examination?

What questions are there in the national civil service examination? What's the difference between national examination and provincial examination? What is a local exam?

Who invented the derivative? What about differential and integral?

If mathematics is a language, why isn't it instilled in our minds by professors like other languages?

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How do pupils learn mathematics?

On the application of economic mathematics in economy.

Application of Discrete Mathematics in Specific Fields