=(20+5)×25

=20×25+5×25

=500+ 125

=625

Simple method of induction in primary school mathematics

1, extracting common factor: This method actually uses multiplication and division to extract the same factor, and the remaining items in the exam are often added and subtracted, and an integer will appear.

2. Borrowing borrowing method: You will know the meaning of this method when you see the name. When using this method, we need to pay attention to observation and find the law.

3. Split method: Split method is to split a number into several numbers for the convenience of calculation.