First, mathematics in the human body.
1. If the head length is measured with a ruler, the body length is equal to 7 heads, the shoulder width is 2 heads, the upper limb is 3 heads and the lower limb is 4 heads. You might as well measure it yourself.
Scientists have found that the length of a person can be estimated by footprints. Because the length of a person is generally 6.876 times the footprint. You might as well test it yourself.
Second, group a three-digit number.
1. There are three numbers: 4, 5 and 0. How many three numbers can you make up?
2. How many different three digits can1,5, 9 arrange? What are three digits? What's the smallest three digits?
Third, a few people in the middle.
Forty-three students from Class One, Grade Three, Dongshan Primary School went to visit the exhibition. During the visit, they lined up. The 17th place from top to bottom is Zhao Feng, and the 9th place from bottom to top is angel lee. How many people are there between Zhao Feng and angel lee?
Four, a few people are standing.
There are three empty seats (no passengers standing) on the bus. At a station, 1 people get off and 5 people get on. There are two seats left in this time and space. How many people are standing in the car?
5. What time is it?
When the clock started, did you find that the hour hand and the minute hand were sometimes on the same line, sometimes together, and sometimes at right angles? What time is it now?
Six, a few more.
1. The flower cat has five balls less than the white cat, and the black cat has seven balls less than the white cat. Who has more balls, the cat or the black cat? How much more?
2. Flower chicken lays 2 more eggs than yellow chicken, and white chicken lays 5 fewer eggs than flower chicken. Who lays more eggs, yellow chicken or white chicken? How much more?
There are several groups.
1. The original seven teams participated in the construction work, and now two teams are merged into one team. How many teams are there now?
The original seven groups participated in the construction work, and now one of them is divided into three groups. How many groups are there now?
There are 8 groups in Class One, Grade Two. If you take out six groups and combine every two, how many groups will there be in Class 1, Grade 2 after the merger?
Eight, quick questions and answers
1. What is the smallest number in the three digits? What is the number?
2. What is the smallest number in a single digit? What is the number?
There is a four-digit number. Subtract 1 and it becomes a three-digit number. What is this four-digit number?
4. A two-digit number minus 1 becomes a single digit. What is this two-digit number?