Mixed operation without brackets: the operations at the same level are operated sequentially from left to right; Two-stage operation calculates multiplication and division first, and then addition and subtraction. Mixed operation with brackets: calculate what is in brackets first, then what is in brackets, and finally what is outside brackets.
Course introduction
This part is the decimal elementary arithmetic with brackets. Before that, students had the knowledge of integer elementary arithmetic, had a preliminary understanding of decimals, and could calculate addition, subtraction, multiplication and division of decimals. This unit also learned the division of decimals, so this part is not only new knowledge, but also the end of decimal operation knowledge. Mixed operation of decimals.
Design concept
First, review what are the four operations, the formula of elementary arithmetic and the order of elementary arithmetic. Through the order of integer elementary arithmetic, guide children to think about the order of decimal mixed operation. Then an example is given to illustrate that the operation order of decimal elementary arithmetic is the same as that of integer elementary arithmetic.
Re-understand parentheses, master the calculation process of formulas containing parentheses and parentheses, and be more proficient in the order of decimal mixed operation. Finally, by talking about harvest and after-class consolidation, we can improve our knowledge again.
1, let children know the importance of learning mathematics.
In fact, mathematics is not only not terrible, but also very interesting! As the saying goes, mathematical physics is good, and you are not afraid to travel all over the world. What's more, the future is the era of artificial intelligence, the era of algorithms, and the era of big data, and these lowest-level knowledge is actually mathematics. So for these children who will enter this era in the future, it is very, very important to learn math well.
2. It is a series of long-term activities to strengthen the cultivation of children's mathematical ability and literacy.
Mathematical ability and mathematical literacy are inseparable from mathematical content. Mathematics is now too extensive, too complex and too professional, and even the teaching content of mathematics in primary and secondary schools is extremely rich. How to teach children to learn mathematics better, step by step, parents must not worry, after laying a good foundation, later learning will be much easier.
3. Mathematical ability and mathematical literacy are also inseparable from mathematical thinking.
Mathematical thinking is hierarchical, and different grades have different requirements for children's thinking ability. In primary school, students should master certain algorithms. In this period, memory plays a very important role. But at a certain learning stage, memory alone can't solve the problem.
In junior high school, mathematical ability is manifested as logical thinking ability, including logical thinking ability such as classification, induction and deduction. Therefore, it is not difficult to find that some children are good at math in primary school, but not necessarily in junior high school. There is a reason for this.
High school mathematics requires higher logical thinking ability, which requires students to have a deeper understanding of mathematics and be able to grasp the problem as a whole. Learning permutation and combination and probability statistics is the most difficult, which requires students to have a good overall grasp ability and a high degree of thinking rigor. Solid geometry and analytic geometry require spatial imagination ability.