A key middle school in Yunnan recruits primary school graduates. Topic: The monitor sorted out the grade number and found that there were two more people in the third row (vertical row), two more people in the fifth row and two more people in the seventh row. How many people are there at least in this grade? Why?

① (common multiple of 3, 5 and 7) 3X5X7= 105 (person)

② (I learned that there were two more people, so I added two) 105+2= 107 (people)

(Don't be too careless, the captain is sorting out the team, and he is included in the annual series) 107+ 1= 108 (person)

④ Answer: Grade one * * students 108, because the number of grade one students is calculated as 107, but the team leader has no statistics, so the number of grade one * * students is 108.

This topic, the topic is the basic topic, mainly discusses the students' ability to examine questions, which requires some care. Even if the team leader is not added to the final calculation, nearly half of the scores will be deducted, so remind students to look at the questions carefully and think before writing! Junior high school mathematics mainly examines students' foundation and carefulness, so students don't have to worry. But the fatal point is that the topic is "people around you." You must be careful and careful, observe and observe!