When we came to the place where tomatoes were sold, my father asked, "How much is it?" The boss said, "1 yuan 2 jiao 1 kg." "I'll buy 3 Jin." Dad said. The boss weighs 3 Jin. Dad asked me, "Do the math, how much is a * * *?" I think: Easy, 1.2 times 3, isn't it equal to 3.6 yuan! I readily replied, "3.6 yuan." Dad said humorously, "Congratulations, you got it right!" " After dad paid the money, he went to the place where vegetables were sold. He asked, "How much is this cabbage? 1 kg? " The female boss said, "1 50 yuan." Dad asked me again, "I bought 2 Jin." Now I have 5 yuan money. How much should the boss give me back? " I think: 1.5 times 2 equals 3 yuan, and 5 yuan minus 3 yuan equals 2 yuan. "I replied," Looking for 2 yuan. " Dad said, "Yes! "
Walking out of the market, I suddenly realized that mathematics is often used in my life.
Math diary's reading with even numbers in senior three: that is, reading the text, students should read the teaching content of the next lesson word by word, find out the central problem, make clear the purpose requirements, and strive to understand the basic structure of new knowledge (such as definitions, theorems, problem-solving methods, etc.). ), and make a general grasp. Completely defeated by Class Two! "。 The news poured cold water on us! I thought all the boys in our class could easily win Class Two, but I didn't expect to be defeated! But I think they did fight hard on the court, maybe their opponents were too strong.
But we are not discouraged, because the female gladiators in our class are not as good as before!
Finally, it's an exciting moment! The female gladiator in our class is finally going to compete! The first players are Du and Sun Weibi from Class Three. You know, Sun Wei is not easy to beat! She is the goalkeeper of the school women's football team, and her serve is really wonderful! So, we all think Du can win.
People's Education Edition, Grade Three, Volume II of Mathematics, how to multiply two digits, for example: 12×60.
1 2
× 60
7 2
Is there an exercise of multiplying two digits by two digits in the second volume of mathematics in the third grade of primary school? Do you arrange the numbers in ten to ten and one to one? Multiply separately, and finally add, for example: 12 × 34 = 408.
Yes, I will start to learn the multiplication of two digits in the third grade of primary school ~ ~!
So there must be two-digit multiplication exercises ~
Five. I can figure it out.
1, a number written directly.
50×50= 80×30 = 52020=
60×30 = 2 1×40= 60×200=
10×500= 600× 13= 25×200=
83×40 = 70×50= 45×20=
2. Use vertical calculation.
32× 13= 27×56= 43×58=
25× 17= 63×72= 45×25=
3. Off-mold calculation.
68+24×40 125÷5×39
78÷3÷5 125×8+23 1
Multiplication of two digits, write casually, 12* 13= 23*45= just write two digits. If you don't know the answer, look it up with a calculator.
Calculation problem:18 * 56 24 * 36 42 * 26 66 *12 ........
Application problem: Xiaohong bought 16 picture books, each 18 yuan. How much are these books?
Hongxing Primary School plants trees on the mountain, with 2 1 tree per class. /kloc-how many trees have been planted in class 0/2?
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Math 1 book 2, grade three, how to write the teaching plan of multiplying five double digits by two digits? Teaching objectives
1. Make students orally calculate the whole ten and the whole hundred times the whole ten, and can orally calculate the two-digit times the whole ten and the whole hundred (each product is less than ten).
2. Make students experience the calculation process of two digits and master the calculation method of two digits.
3. Let the students estimate by multiplication according to the specific situation and explain the estimation process. 4. Enable students to use what they have learned to solve simple problems in life and feel the role of mathematics in daily life. Second, the content analysis
This unit is based on students' proficiency in calculating integers, multiplying integers by one digit and multiplying two digits by one digit (each product is less than ten), and mastering the calculation method of multiplying multiple digits by one digit. The main contents of this unit are: oral multiplication and written multiplication.
The oral calculation in this unit mainly includes two contents. The first content is an integer of ten, an integer of one hundred times and an integer of ten. It is taught on the basis of oral calculation of 10 and 100 times of a single digit. The second content is estimation, that is, the estimation of two digits multiplied by two digits. It is taught on the basis that students have learned the estimation of multiplying two or three digits by one digit and mastered the basic oral calculation method of multiplication. The content of written multiplication is to multiply two digits by two digits, which is taught on the basis of learning to multiply multiple digits by one digit.
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The pen calculation of multiplying two digits by two digits is the focus of this unit. Students have mastered the calculation method of double-digit multiplication, which can not only solve practical problems related to it, but also lay the foundation for learning multi-digit elementary arithmetic. But also lay a foundation for students to solve the multiplication problem in which the factors encountered in life are mostly digits.
This unit strengthens the teaching of "solving problems" The organic combination of calculation teaching and problem-solving teaching is helpful for students to understand the function of calculation and the close relationship between mathematics and real life. It is also very beneficial to cultivate students' ability to solve problems with mathematics and a good sense of numbers. Thirdly, the analysis of learning situation.
Multiplying two digits by two digits means that students have mastered the formula of multiplication, and two digits are multiplied by one.
Number, have a certain computing ability, and further study more complex calculations. With the basis of multiplying two digits by one digit, it is not difficult to learn how to multiply two digits. Third, the design ideas
Simple calculations will make students feel boring, but calculations from real life will greatly enhance students' interest. According to students' age characteristics and knowledge structure, in the teaching of this unit, students should first understand the close relationship between calculation and daily life, and many problems can be solved through calculation, so that students can learn calculation methods in daily life cases and improve their calculation ability. First, understand and master the oral calculation method of integer 100, then learn the estimation multiplication and master the estimation method. The written calculation of two-digit multiplication is taught in two steps. One is to teach multiplication without carry, so that students can master the calculation method from easy to difficult.
The vertical formula of multiplying two digits by two digits in the second volume of mathematics in the third grade of primary school is as follows:
1 1
* 1 1
-
1 1
1 1- Add two numbers: 1 1 Add1/kloc-0.
-
12 1- answer