Blog Mathematics (lessons, class hours)

Multiplication of integers by a two-digit number (7th grade)

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Lagushina Alfiya Galimzyanovna
mathsman
ISS(K)OU 8 species
d. Troitsk, Chelyabinsk region.

Theme: “Multiplying integers by two digits”

Goals:
1) Improve computational skills within 1,000,000;
2) Correction of verbal memory, correction of thinking based on exercises in establishing logical connections and patterns.
(3) Education of love for their city, homeland, education of mutual assistance, responsibility.

Equipment:
Magnetic recording of wave noise;
Individual photo cards drawn chamomile flower, slides, CT

Organizational moment What color you can show your mood (green or black), draw it. Slide 1
Updating
knowledge
The sound of the waves is being recorded.
Today we will talk about our hometown of Troitsk.
Where did you hear the sound of the waves?
What rivers flow in our city? (answer: Uy, Uvelka)
The waves brought us numbers. Read them: (Children give numbers that can tell a lot about our city.)
On the board is a picture of chamomile on the petals of chamomile given questionsWhich ones? Who? When? How much? What? / Numbers: 948, 18, 83.862, 3, 267, 70,000,000
948 -valuable objects including 105 architectural monuments, 46 monuments of urban planning, 24 historical monuments
18 -Schools are now in our city and they are all computerized.
83.862 People living in our community (58)
3 — the Whale of mechanical engineering in our city is an electromechanical plant (the business plan of which amounted to 320.000.000 rubles for 2010, this is higher than last year’s figure by 20%), it is a machine tool plant that has mastered the production of up to 200 models of various machines, it is a diesel plant. It is the only manufacturer and supplier of units, components and parts for high-speed modern diesel engines.
270 - Years of Troitsk in June 2013.
70.000.000 passengers per year carry PATP on all 19 routes (there are messages made by students)
Troitsk is a major industrial, educational and cultural center. This city is a museum full of open air.
The question of chamomile Who?
Slide 13. Relay (relay)Students decide examples and make up the word – Neplyuev) 540: 90 N
630:70 E
800: 80P
420: 60 L
81:27 Yu
30: 30 E
280: 70 BStudents go to the board and solve examples of different difficulty levels.
Answer: 6, 9, 10, 7, 3.1.4 teacher shows a photo of Neplyuev.
Find the meaning of the expressions: on the board hangs a table with pockets of different difficulty levels: I, II, III PT students approach the table and choose their tasks: (perform it further is checked) all get the answer 1743 (answer to the question of chamomile WHEN?
Level 1:
1 x 1 = 1
14 : 2 = 7
16 : 4 = 4
18 : 3 = 6
2nd level
208 х 4 + 911 = 1743
3rd level
543 + 403 х 3 = 1743
PET
112 х 12 + 399 = 1743

What does this number tell you? (this year the Trinity Fortress appeared on the left bank of the UI River)

Decision
task
Do we answer the question how much?
Tajiks, 134.
Tatars – 49 times more than Tajiks
Russian – 61.126 people more than Tatars.
How many Russians live in our city? 2 diagrams of solving the problem are given: (select the solution scheme)
In Troitsk live according to the all-Russian census of 2010, representatives of nations and nationalities 83.862 people, Tatars 6566 people, Russian 67.692 people, Ukrainians 3.553 people.
We have named only three nationalities, to show a table of nations and nationalities living in our city, and they live more than 58 nationalities.
Physminooth Physminooth
Consolidation of the material passed. Working in groups. Answering the chamomile question:
In order to find out what buildings were in our city before 1917, i.e. before the revolution, i.e. at the beginning of the 20th century, you must solve examples, work in pairs and individually. Multilevel assignments are given.
10 schools, 20 windmills, 43 factories, the number of workers in these factories before the revolution was 1096 people, 12 pharmacies.
1st
6576:6=1096
43000:1000= 43
1024х36=36164
57216х22=1258752
2nd
20.000:100=10
704х32=22528
1334х14=18676
3rd
1000:100=10
11x11=121
542х12=6504
4th
4x2=8
5x3=15
8x8=64
32:4=8
64:8=8
Lesson outcome What interested you in class?
What else would you like to know?
Thanks for your work. It's been a pleasure talking to you. Show your mood again at the end of the lesson.

Fragment of the presentation to the lesson, 23 slides in .ppt format

Slide 3

multiplication

Slide 13

multiplication

Slide 14

multiplication

{module Google_kvadrat}

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