Teaching methods of ingenious calculation in primary school mathematics 1
(A) rounding priority algorithm
In the simple calculation of addition and subtraction, the basic idea is "rounding" According to the properties of commutative law, associative law and subtraction of addition (multiplication), if any of them can be rounded, the formula can be changed to make the rounded numbers form a pair of good friends, which can make the rounding calculation simple. For example: 298+304+ 196+502. In this problem, additive commutative law's associative law can be used to add up the numbers that can make up whole ten, whole hundred, whole thousand, etc. , which can make the calculation simple, so the original formula = (298+502)+(304+ 196.
Teaching methods of ingenious calculation in primary school mathematics II
(2) Symbol moving method
In addition, addition, subtraction, multiplication and division of the same level, the position of numbers can be interchanged according to the needs of operation and the characteristics of the topic, which can make the calculation simple. Special reminder: exchange the positions of numbers, and note that the operation symbols also change positions. For example: 464-545+836-455. Observing the example, you will find that if you want to calculate from left to right according to the convention, 464 MINUS 545 is not enough at all. In primary school, students can't do it, so to do this problem, we must first observe the characteristics of numbers and make simple calculations. According to the sign shift method, the original formula is = 464+836-544.
Teaching methods of ingenious calculation in primary school mathematics 3
(3) Division number rounding method
According to the law of operation and the characteristics of numbers, the numbers in formulas are often divided and reorganized flexibly to form integer ten, integer hundred and integer thousand respectively. Example: 998+ 14 13+9989, 998 plus 2 can be added to 1000, 9989 plus1can be added to 10000, so we put/ The original formula = (998+2)+1400+(11+9989) =1000+65438+10000 =12000.
Teaching methods of ingenious calculation in primary school mathematics 4
(D) the method of finding the benchmark number
Many figures add up. If these numbers are close to a certain number, you can determine this number as the reference number, compare other numbers with this number, add the redundant part to the multiple of the reference number, and subtract the insufficient part, thus making the calculation very simple. Example: 8. 1+8.2+8.3+7.9+7.8+7.7. The six addends in the example are all around 8, and 8 can be used as a reference number. First, you can find the sum of six eights, then add the parts less than eight, and subtract the parts greater than eight. According to this method, the original formula = 8.
Teaching methods of ingenious calculation in primary school mathematics 5
1. Clear arithmetic
Teaching students the key to solving problems, fast calculation requires students to master the commonly used simple operation methods, including the method of directly applying laws and properties to make the operation simple, and the indirect application of operation laws and properties after decomposition and combination. This is a simple operation method. The former is more popular and acceptable. The latter is more difficult, but we should pay attention to cultivating students' thinking habit of looking before thinking. Once students can see and want to discover the relationship between data by themselves, and do indirect quick calculation through decomposition or combination, contact law and nature, it shows that students have mastered the "key" of quick calculation and have a high level of quick calculation. In order to cultivate students' thinking habit of looking before thinking and their ability of decomposition or combination. For example, 70-70×3/5 can be converted into 70× (1-3/5), 125× 32× 25 can be converted into 125×8×4×25 and so on. Doing this exercise often can not only deepen students' understanding of arithmetic, but also be effective.
Teaching methods of ingenious calculation in primary school mathematics 6
Grasping comparative teaching and guiding students to choose the best quick calculation method
As far as a calculation problem is concerned, there are more than one calculation method, and one of them must be simple. In order to make the calculation fast, we should try our best to learn to choose the simplest one that conforms to the calculation principle. Therefore, we should pay attention to the discussion of calculation methods in class, make students understand that the method is simple, and carry out different exercises on this basis. We can write several methods for a problem, so that students can find the simplest one, or we can show similar types in different ways. Let the students find the best quick calculation method for each problem, such as: 240 ÷ 6/15 ÷ 26/13 ÷ 6/14/45 ÷ 22/45. These questions are graded, and they are all. Finally, teachers should help students guide and summarize some common types, methods, quick tricks and shortcuts, so that students can gradually form skills mastery methods.
Teaching methods of clever calculation in primary school mathematics 7
Encourage students to ask questions actively and enliven the classroom atmosphere.
In class, students often put forward some incomplete guesses, or an emergency answer, or imagine various solutions to problems and conceive some new wonders that have appeared before. Due to the long-term bondage of traditional "exam-oriented education", some teachers are unwilling to enliven the classroom atmosphere, dare not enliven the classroom atmosphere, and do not know how to enliven the classroom atmosphere for fear of breaking out. In classroom teaching, it is nothing new for teachers to give examples as usual and follow the book. Only the so-called top students can answer students' questions. If the answer is slightly different from the teacher's "standard" answer, it will be completely denied, and the root of the error will not be explored, for fear of affecting the teaching rhythm and making students afraid to raise their hands to answer questions. In this way, a good intuitive thinking will be killed by a stick. In the long run, this kind of.
Teaching methods of ingenious calculation in primary school mathematics 8
Language is humorous and witty, which enlivens the classroom atmosphere.
Humorous language can make people want to listen, be patient, listen carefully and be interesting. Mathematical knowledge is very abstract. If teachers can impart these mathematical knowledge through humorous language, it will certainly attract students' attention. For example, when teaching the course "Conversion between Percent and Decimal", I said to the students: "One Sunday morning, Percent wanted to go to Decimal's house to play, and a small river blocked its way. The decimal over there doesn't look like his family, so he won't be allowed to cross the river. How about you do me a favor and turn the percentage into a decimal and cross the river to visit the decimal house? " Students listen attentively to the story and seriously think about this problem in a fairy-tale artistic conception.
Articles on ingenious mathematics teaching methods in primary schools;
★ Several common teaching methods in primary school mathematics teaching
★ What are the common teaching methods of primary school mathematics?
★ Teaching methods commonly used in primary school mathematics teaching
★ What are the latest mathematics teaching methods in primary schools?
★ What are the methods of mathematics teaching in primary schools?
★ Practical mathematics teaching methods in primary schools
★ Primary school mathematics teaching methods
★ What are the teaching methods of primary school mathematics?
★ About the teaching methods of primary school mathematics