Keywords: improving teaching efficiency, showing the combination of innovative spirit and creativity
In primary school mathematics teaching, we can integrate modern educational technology with primary school mathematics teaching, accurately grasp and skillfully use the fusion point of the two, which can not only stimulate students' interest in learning mathematics, promote students' positive thinking and independent exploration, but also cultivate talents with innovative spirit and ability.
First, use modern educational technology to demonstrate the formation process of knowledge.
A misunderstanding of traditional mathematics is that it only seeks results and ignores processes; Innovative education requires maximum attention to the formation process of knowledge, because only by understanding the formation, structure and linking methods of knowledge can students use these methods to create new achievements.
When teaching the surface area of cylinder, I used modern educational technology and achieved good results. I did the unfolding process of the cylinder. Students see that it is cut along a height of the cylinder, and then it is slowly unfolded. Finally, two bottom surfaces (circles) and one side surface (rectangles) of the cylinder are displayed on the screen. However, I didn't stop there, but continued to ask: "What shape can the side of the cylinder be if it is cut along a height of the cylinder?" Students can imagine that it may be a square.
Then continue to display on the computer: as long as the height of the cylinder is equal to the perimeter of the bottom, the side development diagram of the cylinder is square. Then continue to ask: "What other shape can the side development diagram of the cylinder be?"
Students' answers may also be parallelograms. The computer shows that the side of the cylinder is obliquely cut and unfolded to form a parallelogram. Some students also mentioned what shape two knives might be if they were allowed.
Second, use modern educational technology to show the internal connection of knowledge.
In primary school mathematics teaching, the effective application of modern educational technology can string the isolated and scattered knowledge that students usually study into lines, blocks and nets, stimulate students' interest in learning, promote students' positive thinking and independent exploration, and cultivate students' creative ability; At the same time, it also organically infiltrated the dialectical materialism thought that "things are generally related" and "can be transformed into each other under certain conditions".
For example, when reviewing the calculation of plane graphic area, I first guide students to review the derivation process of various graphic area calculation formulas according to the arrangement of teaching materials, and then the conversation turned: "In fact, except for the circle, the other five graphics can be calculated with only one formula." The students were shocked: "How is it possible?"
At this time, the teacher dynamically demonstrated the process of trapezoid changing into triangle with courseware. Some students found that: the top and bottom of the trapezoid gradually become shorter, and when it becomes a point, it becomes a triangle; A triangle can be regarded as a trapezoid with a base of 0, so the area of the triangle can also be calculated by the area of the trapezoid: s = (a+b) × h ÷ 2 = (a+0) × h ÷ 2 = a× h ÷ 2. The teacher immediately praised these students and further inspired them: "Students, what else can you think of from this example?"
Through thinking, discussion and communication, students find that trapezoid and triangle, parallelogram, rectangle and square can be transformed into each other; Trapezoidal area formula is a universal formula, which can be used to calculate the areas of four other figures except circles. I don't know a student who said after class, "The trapezoidal area formula can also calculate the area of a circle!" " I was quite surprised and said, "Can you tell me the reason?"
"Since a triangle can be regarded as a trapezoid, a sector can also be regarded as a trapezoid, and a circle can also be regarded as a trapezoid, but the center of the circle is regarded as the upper bottom of the trapezoid, the circumference of the circle is regarded as the lower bottom of the trapezoid, the radius of the circle is regarded as the height of the trapezoid, and the area is S = (a+b) H ÷ 2 = (0+2 π r) × R ÷ 2 = 2 π r × I was amazed by this student. His speech not only perfected my point of view, but also showed the students' thinking on this issue.
In teaching, I creatively communicated the internal relationship between the trapezoidal area formula and several other plane figure area formulas by using modern educational technology, which fully mobilized students' initiative and interest in learning, cultivated students' innovative ability and effectively improved classroom teaching efficiency.
Third, use modern educational technology to show the infinite charm of numbers.
Creativity comes from loving what you do. Only by fully showing the beauty and charm of mathematics to students, students will not regard mathematics as a timid road, thus creating a "new" that is even naive and ridiculous to adults.
For example, after learning proportion, I ask students to think: the smallest two-digit number has six divisors (12); What is its divisor? ( 1、2、3、4、6、 12); Can these divisors form proportions? After simple thinking, students find that proportion can be formed. I asked again, "Can only one ratio be formed? How much proportion can it form? " After discussion, the students found many proportions. I input the proportion they said into the computer screen in time.