An Obstetrician gives an answer to the ＂dispute＂ caused by a primary school math problem.

　　This topic was posted in a circle of friends by a father who is a teacher in a university in Hangzhou. It is the classroom assignment of his son Dudu in the first grade.

　　The topic is: Xiaotian is 10 years old this year, and his brother is much older than him. How old is his brother? There are four answers: 60 years old; 18 years old; 12 years old; Nine years old. Dudu chose 60 years old, but was wrongly sentenced.

　　Although both parents are university teachers, both of them read the question carefully and said they could not understand it. Since "much older", you should choose 60 years old. "The correct answer to this question is the second one. I really don’t know how to explain to my son why I have to choose 18 years old." Du Dad said in a circle of friends.

　　The reporter made an entrance survey.

　　One third of the children chose "60 years old"

　　Qianbao reporter checked, this question comes from the supporting classroom exercise book of first-grade mathematics of People’s Education Press, which is more formal.

　　We went to two primary schools in Hangzhou to do a survey on entering classes. For this question, 21 of 68 children got the same answer as Dudu, and all thought that their brother might be 60 years old.

　　In fact, we asked many primary school math teachers, and they all agreed with the answer of 18 years old.

　　Cheng Yanjuan, a first-grade math teacher at Hangzhou Tiancheng Education Group, recently approved this topic in her exercise book. "Many students in the class choose 60 years old because they pay attention to ‘ Much bigger ’ These three words, but the children ignored ‘ Brother ’ This restriction. " She said, "The original intention of this question is to examine students’ attitudes towards ‘ Much bigger ’ The understanding of this word must also be analyzed in combination with the actual situation. "

　　When doing the survey, we asked those students who chose 60 years old, "How old are brothers?" Many children immediately reacted: "60 years old should be the age of grandfather, not the age of brother."

　　How much bigger is "much bigger"

　　The teachers answered this question.

　　Teacher Cheng Yanjuan said: "If you follow ‘ Much bigger ’ In three words, you can choose 60, because 60 is really much older than 10. But this question also involves real life — — My brother’s age. "

　　Teacher Wang, a math teacher in a public primary school in Hangzhou, explained that this is a question of size, but it is different from the specific size. It examines the first-year students’ understanding of some commonly used fuzzy concepts in daily life scenes, such as "much bigger", "much smaller", "bigger" and "smaller".

　　"Like this ‘ Much bigger ’ 、‘ Much smaller ’ The concept of ""is broader than fuzzy, so it must be answered by combining the specific situation of the topic and the comparison of options. Like this question, if you only see ‘ Much bigger ’ Then I will choose 60, but the title clearly points out ‘ Brother ’ Then you should choose 18 years old. " The teacher said.

　　After excluding the age of 60, why is the difference between 18 and 10 8 years old, even if it is "much bigger" in the title? Teacher Cheng Yanjuan explained this way: "A 10-year-old child is probably in the fourth grade, and at the age of 18, he should be in the third year of high school. From this perspective, a senior three student and a senior four student are really more suitable to use ‘ Much bigger ’ This word. "

　　Everything is afraid of being true.

　　Parents question the "standard answer"

　　Many parents don’t agree with the teacher’s explanation.

　　Du Da mentioned in the previous article said, "It is right to choose 18 years old according to logic, but the questioner underestimated modern technology. George Murdoch’s eldest son was born in 1958 and his youngest daughter was born in 2003, so 60 years old is not wrong. "

　　The father of another first-grade child insists that it is right to choose 60 years old, because the "much bigger" in the title is the purpose of the investigation. After all, it is only the first grade. If we look at it from the physical possibility, it is somewhat difficult for the child.

　　The father said, "My child has done many questions of this type. If he is asked to choose, he will definitely choose 18 years old, but choosing 60 years old should not be wrong. Because in the child’s mind, why can’t my brother be 60 years older than my brother? " Nowadays, there are many only children. In the eyes of children, a brother may not only be his parents’ own, but he is of the same generation with a big age gap, and his parents will generally teach him to call him "brother".

　　Another father said, "If my child chooses 60 years old, I will not think that he is wrong, but will encourage him. I hope to cultivate his spirit of questioning, instead of learning to adapt to the rules and adapt to the standard answers. "

　　The comments of "Shengxuebao" netizens are also very sharp.

　　This kind of question is unnecessary.

　　Yesterday, Qianbao Education WeChat WeChat official account "Shengxuebao" pushed this report, and the netizens left a very positive message. Of course, most netizens object to parents’ "obsessing" approach, thinking that it will only make children "more and more at a loss".

　　Netizen "Bingjige": The teacher explained it correctly, so it should be based on most situations, and this case is a special case. It examines students’ understanding of the reality of life, and some parents just like to be true.

　　Netizen "Bai Yingchun": For this kind of question, it is really unnecessary. After all, the 60-year-old brother is an extreme case, and of course he can’t be right. When you encounter such a problem, just explain it to your child.

　　Netizen "Shan": I just discussed this question with my children yesterday. I hesitated between 60 and 18. The children thought it should be 18, and said that there was no 60-year-old brother. Adults thought it was complicated after watching it too much.

　　Netizen "Dream Boat": I think this topic is very good! Even if 60 and 18 are right, 18 should be accurate, because 60 means "very, very much" rather than "a lot". Parents can discuss some knowledge with their children in a timely manner in addition to the answers under common sense. For example, if the elder brother is really 60 years older than the younger brother, what are the possibilities? Instead of clinging to this handful of "brothers and younger brothers", why bother!

　　We asked the obstetrician.

　　The doctor gave an unexpected answer.

　　With the spirit of getting to the bottom of the matter, we have looked up a lot of information and found that it is not uncommon for brothers and sisters to have very different ages, and it is more common in ancient times.

　　Stanley Ho, the gambling king of Macao, has married four wives and had 17 children. When He Chaoxin, the 17th child, was born in 1999, Mr. He was 78 years old, and the age difference between the children was 52 years old.

　　On December 9, 2016, mick jagger, the 73-year-old lead singer of the Rolling Stones, became a father for the eighth time. Before that, he had seven children, the oldest difference between them was 46 years old … …

　　However, according to medical science, there are two main situations: one is half-brother; The other is egg donation. The possibility of natural fertility of men has always existed in old age. Although women are less likely to have fertility after menopause, they also have the opportunity to give birth to babies by donating eggs.

　　Han Xiujun, director of the Sixth Department of Obstetrics and Gynecology Hospital affiliated to Zhejiang University School of Medicine, said that in 2016, a 61-year-old ultra-old woman from the Provincial Women’s Insurance Company successfully conceived with the help of IVF, and finally gave birth through cesarean section. The woman’s husband is also about the same age.

　　"Mothers over the age of 35 are often referred to as elderly mothers. Generally speaking, the older you get, the lower the probability of natural pregnancy and the greater the risk of pregnancy. However, it is also wrong to say that you can’t have children due to age restrictions, because it can also be achieved through assisted reproductive technology. For example, the 61-year-old woman can still conceive successfully through IVF after menopause. " However, from the perspective of doctors’ prenatal and postnatal care, Director Han believes that the more suitable option for this first-year math problem should be 12 years old.

　　"Because the second child is regenerated after an interval of 2 to 3 years, it is most suitable for the mother to recuperate, and it can also make the family more energetic in raising children, so the age difference between my brother and Xiaotian is best around two or three years old." Director Han said. (qianjiang evening news reporter Shen Meng and correspondent Chen Hongcheng Dai Xinyi)