Thinking of solving problems: In practical problems, division is generally used when the key word is average, multiplication is generally used when the number is multiple, addition and subtraction are generally used when the number is more than or less than the number, and formulas are applied according to the key words.

Problem solving process:

(3+2)×(3+2)

=5×5

=25

There are 25 students in Class One.

Extended data => Vertical calculation-calculation result: first, align the last digits of the two multipliers, then use the second multipliers respectively, starting from the last digit, multiply each digit by one multiplier in turn, and finally accumulate the calculation results into a product. If the multiplier is decimal, the corresponding multiple can be expanded first, and then the product can be reduced by the corresponding multiple;

Problem solving process:

Step 1: 5×5=25

According to the above calculation results, the total is 25.

If in doubt, please ask questions. If satisfied, please adopt them.