How to cultivate students number sense in primary school mathematics teaching

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3.If the bleeding under the nail bed is caused by trauma, and the blood does not flow out, so that the root of the nail bed is bulging, and the pain is unbearable and you can't sleep, you can prick a small hole with a red-hot sewing needle near the root of the nail to drain the accumulated blood, and then apply pressure to bandage the nail after disinfection.

Precautions. 1.After the fingernails are squeezed out, if it is night and you cannot go to the hospital, you should disinfect the area, and if you have antibiotic ointment at home, you should remove the upper layer. Be sure to go to the hospital the next day. to prevent infection.

2.Don't cut your nails too "bald", otherwise it will cause the nails to rupture and bleed.

3.People with a history of nail rupture and bleeding should also pay attention to eating more foods containing vitamin A in their daily diet, such as cabbage, radish, leeks and pork liver, etc., to increase the elasticity of **.

Nail care. 1. Use nail clippers to trim from one side of the nail to the length you want. Trim slowly from the side, and don't cut the whole nail at once from the middle, as the nail will break easily under too much pressure.

Nail repairs. 2. Start trimming with sand strips.

3. After repairing the shape, apply dead skin softener to the finger skin, and apply it to the semi-circle where the nail and the flesh meet.

A total of 3 sheets. Human nails.

4. People with a lot of dead skin can pour a little warm water into a hand bowl and soak it for about 5 minutes, so that the dead skin will become soft and better pruned.

5. When there are meat thorns, you can cut off the dead skin first. Before cutting, apply a layer of softener to the nail edge skin, leave it on for a minute, and wait for the keratin to soften, so that it will be easy and thorough to remove. If you remove the dead skin without softening, it will be painful.

To remove dead skin, first push the cuticle on the nail surface to the nail edge with a finger skin push, then trim it along the nail edge with dead skin scissors, and finally trim it to a perfect shape with a dead skin fork.

Note: Gently push up the dead skin with the finger skin, the dead skin can not be pushed very hard, push the irregular finger skin into a neat circle, the dead skin and the nail surface at a 30-degree angle, the finger skin and the nail should fit the best, do not push the dead skin into it for the nail bed to be long, this will only make the nail injured, easy to be infected with bacteria.

6. Apply nutrient oil, as long as you point a little bit on the finger skin, it is enough to pull, and you don't need a lot. Then massage the fingertips in circular motions, massaging the nourishing oil onto the surrounding finger skins.

7. Use polishing strips (polishing blocks) to grind back and forth on the nail surface to smooth the nail surface, so that the nail polish also looks good, and there will be no strip feeling. Polishing should be done at most once a week, otherwise the nails will get thinner and thinner.

8. Spray disinfectant or nail polish remover with a cotton swab to clean the inside of the nails. Move lightly and don't hurt the nail bed.

1. Number sense comes from life experience.

Mathematical knowledge is applied to and in life. Mathematician Hua Luogeng once said: The universe is big, the particles are small, the speed of rockets, the ingenuity of chemical industry, the changes of the earth, and the complexity of daily use, mathematics is everywhere.

This is a wonderful description of mathematics and life. Mathematics teaching must start from the familiar life situations and things that students are interested in, so that they have more opportunities to learn and understand mathematics from the familiar things around them, feel that mathematics is around them, feel the interest and role of mathematics, and experience the charm of mathematics.

For example, when teaching the understanding of numbers within 10, students should be provided with more familiar materials in their daily life, such as a piece of cake, a person, a table, a boat, and ....... In the process of social practice, feel the distance of 1 km and 10 km; Go to the savings bank to deposit, withdraw, ** interest rate table, to feel the estimation of % interest; Go to the supermarket to see, weigh and estimate the weight of various vegetables and meats; Distribute workbooks, feel the average score, and so on. These activities are very popular with students, which not only enlighten number sense, but also cultivate students' behavior of "getting close to mathematics", making mathematics learning fun.

2. Number sense comes from hands-on practice.

The famous psychologist Jean Piaget said: "Children's thinking begins with action, and if the connection between action and thinking is severed, thinking cannot be developed." "Hands-on practice is a special kind of cognitive activity, in this dynamic cognitive activity, it not only satisfies the psychological characteristics of primary school students such as curiosity, activity, and performance, but also can concentrate attention and stimulate motivation.

To enable students to experience the joy of success in their own creations and to achieve true understanding. Hands-on activities are the front line of students' learning process, and they are also a free world for students' active development. The cultivation of number sense is inseparable from hands-on practice.

For example, when teaching "Calculation of the Area of a Trapezoid", first review the area formula of a triangle and the derivation process. Then have students work in groups using scissors and trapezoidal paper to discuss with each other. Several different methods have been derived; There are two identical trapezoids that are put together into a parallelogram; There is cutting a trapezoid diagonally into two triangles; There is cutting a trapezoid into a parallelogram and a triangle; There is also the method of cutting and patching a trapezoidal shape into a triangle.

Finally, have students work together to discuss and summarize the area formula for the trapezoid. In this way, the number sense training is implemented in specific operation activities, but students can deepen their understanding of mathematical knowledge and establish a good number sense. Students not only acquire knowledge, but also give full play to students' sense of subjectivity and cultivate their sense of innovation.

Mathematical thinking refers to the ability to think through mathematical methods to solve problems. Cultivating students' mathematical thinking ability is an important means to cultivate students' number sense. Teachers can improve students' mathematical thinking ability by improving students' awareness of problems, inspiring students' spirit, and cultivating students' logical reasoning ability.

At the same time, teachers should also pay attention to cultivating students' innovative spirit and early imitation practical ability, so that students can play the role of mathematical knowledge in practical application.

Mathematics is a very abstract subject, and students often struggle to understand it from their own perspective. Therefore, teachers should use a variety of ways to make students better understand mathematics. For example, mathematical knowledge can be presented in a variety of ways, such as examples, images, models, etc., so that students can understand mathematical concepts from different perspectives.

In short, cultivating students' number sense is an important way to improve students' mathematical literacy. Teachers should pay attention to the learning of basic knowledge, learn mathematics from multiple perspectives, pay attention to the application of mathematical knowledge and cultivate students' mathematical thinking ability, so as to help students better understand mathematical knowledge and improve mathematical literacy.