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Two-digit exchange position law
Let this two-digit number be AB, then this value is 10A+B, and the exchange of ten digits and single digits is10B+A .. (10A+B)-(10B+A) =10A+. B or b > A it's all the same

Math learning methods 1. Develop associations around the teacher's remarks, and don't stick to the rules;

2. To clarify the narrative ideas of textbooks, we should not just look at literal expressions;

3. Listen to the teacher's key points and difficulties, and don't cover everything;

4. We should concentrate on overcoming learning disabilities and go our own way without interference;

5. Take brief notes on the basis of understanding, don't get the message and be self-righteous.

How to learn mathematics well must first cultivate the interest in mathematics learning;

Secondly, the focus of mathematics learning is foundation, and foundation is very important. Be sure to lay a good foundation, otherwise it will be more difficult to learn in the future.

Finally, to learn math well, we must make good use of textbooks, notebooks and wrong books.

Mathematics learning is an arduous project, and there are many details that students need to taste and ponder.