Current location - Training Enrollment Network - Mathematics courses - ? This is a math problem in the third grade of primary school. If a teacher can tell me how to fill in the brackets, I can only calculate the result, but I can't fill it in.
? This is a math problem in the third grade of primary school. If a teacher can tell me how to fill in the brackets, I can only calculate the result, but I can't fill it in.
First of all, if one hundred people retire, it will be ten tens. If one person retires, it will be ten ones. Then, because I dropped one place, the first space was filled in the space to the right of 10. Because ten people retreat to one, it changes from ten to nine tens, which means filling nine.

So the answer is 10.

9 10