Species signs of turtles. Approximate calculation of areas The largest turtle in the world is a leatherback turtle

General lesson

on this topic

"Integers"

in 5th grade

Mathematic teacher

MBOU Gochit secondary school

Republic of Buryatia

Togoshieva Valentina Baldanovna

Lesson Objectives : repeat and systematize students' knowledge of the material covered, development logical thinking and cognitive interest in the subject.

Lesson plan:

1. Actualization of basic knowledge.

A) Oral work.

b) Answers on the board.

C) Individual work.

2. Solving the problem

3. Independent work in pairs.

4. The result of the lesson. Homework No. 736

Org.moment

Far, far away, where even planes do not fly, is the Country of Mathematics. In this unusual country there is an amazing city - the City of Numbers. In this wonderful city there is one unusual street called "Natural Numbers". And today we will walk along this street again, see all its sights, and the walk will take place according to such a plan (the teacher introduces the lesson plan).

Repetition.

The most important thing on this street is the equation. Therefore, 3 pers. go to the board to work on the cards.

Card#1

a) Tell the rule how to find the unknown term and solve the equation.

B) Tell the rule how to find the unknown factor and solve the equation.

Card number 2.

a) Tell the rule how to find the unknown subtrahend and solve the equation.

B) Tell the rule how to find the unknown reduced and solve the equation.

Card number 3.

a) Tell the rule how to find the unknown dividend and solve the equation.

B) Tell the rule how to find the unknown divisor and solve the equation.

At this time, oral count No. 634. After the oral count, we will hear those who answer at the blackboard.

Then the generalization of the teacher according to the table.

The solution of the problem.

Giant tortoises live on the islands of the Pacific Ocean. They are of such size that children can ride while sitting on their shell. This turtle swims beautifully, its limbs have turned into flippers. Turtle shells are used to make ornaments, and eggs and meat are used as food.

Solve the equation: 8x-3683=1117 and you will find out the mass of this turtle in kg.

Answer: 600 kg.

Independent work in pairs.

№1. The largest land animal is the African elephant. Find out:

A) height in cm, solving the example: 125*4-(125+25)= cm.

B) body length in cm, solving the example: 65 * 5 + 65 + 60 \u003d cm.

C) weight in kg: 6500-2000+1500= kg.

№2 . On the the globe birds live - unmistakable compilers of the weather forecast for the summer. The name of these birds is encrypted with tasks. After completing them and replacing the answers with letters, you will read the name of the meteorological birds.

37003-8397=

722257+81673=

450:18=

21*15=

X+605=700

Y*22=1342

8a+3a-2a=

30y-2y=

№3. “True, children, I’m good, I look like a big bag.

On the seas in the old days I overtook steamships. Who am I?".

In order to solve the riddle, complete the tasks and replace the answers with letters.

1)375843-286927=

2)161236+18765=

3)20s-6s-3s=

4) 5x+x=

5)490:14=

6) 474+p=500

7) 8x+7x=105

№4. One day a thunderstorm broke out in the English county of Cumberland, strong wind uprooted trees, forming funnels. In one of these craters, the inhabitants found some kind of black substance. The name of this substance is encrypted in the tasks:

1)83005-59628=

2) 701960+85971=

3)3428:8=

4)43*24=

5) y-708=194

6) 9x+9x-4x=

Checking independent work.

After checking, the teacher tells. Shepherds began to mark sheep with pieces of graphite, and merchants made inscriptions on baskets and boxes. This happened in 1565. The first pencils had two drawbacks: they got their fingers dirty and broke quickly. Pieces of graphite began to be wrapped with braid, cloth, and for strength they were mixed with sulfur, resin, antimony. Later they began to add clay and a mixture, fired in a kiln. Such a pencil, as we write today, appeared at the end of the 18th century.

Summary of the lesson.

This is where our walk comes to an end. I hope you liked it, and the results are as follows: ....

Homework: No. 736.

The most popular domestic reptiles in our country are turtles. Many owners of such animals believe that keeping turtles is less burdensome than, for example, lizards or iguanas. This is the main reason for buying such a pet for children or simply as a beautiful live "toy" to satisfy the aesthetic taste. However, the unpretentiousness of turtles is a myth, and when starting such a pet, it is important to know everything about the features of his life.

Turtles are certainly beautiful and interesting in their behavior animals of the order of reptiles. The main feature that distinguishes this type of reptile from other animals is the presence of a shell. This strong and "practical" armor consists of a lower part - a plastron and an upper part - a carapace. The shape, size, number of scutes, and shell pattern are important species features of turtles.

It was the shell, despite its severity, that helped this reptile survive for a long 175 million years. All modern turtles have retained a shell, although its shape and color differ in various kinds and depends on the habitat and mode of existence of the animal. For example, in sea turtles, a significant part of the shell is missing, thanks to which these animals have learned to move quickly. Softshell turtles have a round, frying pan-like shell that allows them to easily burrow into the mud.

Over the many millennia of existence, these beautiful animals have not changed much, but the number of some species has reached a critical point in recent centuries. That is why it is important not only to carefully monitor the health of your pet, regularly showing it to a veterinary herpetologist, but also to pay serious attention to keeping the turtle, its diet, maintaining the temperature in the terrarium, and bathing. You can’t start a turtle without first preparing a specially designated place for it and without studying all the features of turtle life.

The most common "domestic" reptiles are land and freshwater turtles. When starting such animals, you need to know that most land animals are herbivorous, and freshwater animals are predators and omnivores. Therefore, the former should not receive animal proteins (meat, eggs, cottage cheese, etc.) for food. Their diet should consist of vegetables, fruits, berries, dandelion grass, clover, plantain. Conversely, the freshwater diet should consist primarily of "food of animal origin" snails, fish, squid, bloodworm shrimp, etc. For freshwater turtles, unlike land turtles, the industry produces a number of good dry foods (Sera, Tetra, etc.)

freshwater turtles

The habitat of freshwater turtles are reservoirs, rivers, lakes and swamps. Such animals spend more time in the water, only occasionally getting out on land to bask in the sun. The most popular species of turtles as pets are: Pond slider(Trachemys scripta); European marsh turtle (Emys orbicularis); Chinese trionyx or Far Eastern tortoise (Pelodiscus sinensis). When purchasing such reptiles, you need to know their features and differences from each other.

The red-eared turtle is most often found in aquatic terrariums. This is a very beautiful reptile with bright red, yellow and orange spots that are located on both sides of the head, resembling ears, for which the turtle deserves its name. Young individuals up to six months have the brightest coloration than older relatives. The upper part of their shell has a color from yellow-light green to emerald green. Over the years, it becomes olive or yellow-brown. In addition, there are patterns of bright yellow stripes and green circles on the shell.

This is a rather mobile turtle, not only in water, but also on land. In addition, this beauty has very strong and sharp nails, which she often uses for self-defense. When taking a turtle out of a terrarium, you should be wary of it. hind legs, with them she will try to push off from the hands. And in general, you should not bring it to the face and open areas of the body.

This is an aquatic turtle that prefers shallow water. She swims well, quickly moving her paws, and hides at the bottom, under stones, burrowing into the silt. Like most aquatic turtles, the European marsh turtle is a predator.

This turtle has an oval, smooth, dark olive-colored shell covered with yellow stripes and spots. The head, legs and neck are also dotted with large dots of yellow color, the shell is colored, as a rule, in dark brown, less often in yellow. The turtle has a long tail, which is about half the length of the shell, it serves as an additional "steering wheel" when swimming, the hind limbs serve as the main tool for this, and the fingers have rather long and sharp claws.

This turtle is an excellent swimmer and diver, and can stay under water for a long time. However, every 15-20 minutes, she needs to surface to stock up on air. On land, European marsh turtles are not as active, but they still move faster than land turtles. On land, they bask in the light for a long time, but at the slightest danger they hide in the water.

This turtle has a greenish-brown shell with a glossy surface. In growth, it reaches 25-30 cm, on top it is covered with soft skin without horny shields. In young individuals, the “back” is covered with tubercles, which gradually disappear with age, and the shell takes on an almost flat appearance. The neck of Trionix is ​​very mobile and long, and the muzzle is elongated into a proboscis, at the end of which there are clearly visible nostrils. The powerful jaws of this predator have sharp cutting edges with which the turtle can cause serious injuries, which makes it quite dangerous. Wounds after such "bites" do not heal well, so this pet must be very careful in handling. In addition, sharp claws are located on the three toes of the paws, which also pose a threat. An unusual feature of Trionix is ​​additional skin respiration, along with pulmonary respiration.

According to amateurs, the Chinese Trionics is a very suitable candidate for keeping in a terrarium, since the ratio of water to land should be equal to 5: 1, and it is very convenient to observe the behavior of the turtle. However, it must be kept separately, since Trionyx can pose a threat not only to its owners, but also to other soft-bodied turtles.

Land turtles

Land turtles live in steppes, forests and deserts. At a sufficiently high temperature, these animals move actively, since the processes in their body occur normally, and closer to winter they fall into suspended animation, that is, hibernation.

Such turtles feed on plant foods - any edible fruits and berries, cabbage, cucumbers, tomatoes, carrots (grated or thinly sliced), lettuce, dandelions, clover, some cruciferous plants (leaves, flowers), young leaves of trees, but sometimes they also eat insects - earthworms, snails. Outwardly, land turtles are all similar, their differences are in color, shell shape, number and type of scutes and claws. The most popular as pets are:

Central Asian or steppe tortoises (Agronemys horsfieldii), Mediterranean tortoises (Testudo graeca), Balkan tortoise (Testudo hermanni), Egyptian tortoise (Testudo kleimanni).

As a pet, this is the most accessible animal of all reptiles, it can most often be found in terrariums. The size of such a turtle reaches 18-30 cm, its shell is relatively wide and round, colored with gray and green-yellow hues, the tail is thin and bony, in males it is much longer than in females. On the forelimbs of such animals there are four fingers, and the fingers of the hind legs are fused. Such turtles are quite slow and very hardy to adverse conditions. environment This is probably what makes them the most popular.

Central Asian turtles rarely drink water, because in nature they have practically no access to it. With an excess of moisture, they urinate, but in the absence of it, they can do without excreting urine. At the same time, a humid environment can provoke the development of pathogenic bacteria in such animals, so it is enough to bathe such a turtle sometimes. Central Asians love to dig holes, so it is best for them to lay soil of large pebbles with a layer of at least 6-7 cm. These turtles also have big “claims” for light and ultraviolet radiation, which must be taken into account when creating a place for them to live.

The shell of such a turtle is convex and high, it has a round-oval shape, usually slightly serrated along the edges. It can reach 30 cm in size. The carapace has dark spots on a light olive or yellowish-brown background, which increase with age. Sometimes the spots merge, and the whole turtle acquires a dark, almost black color. On the back side of the shell there is one horny tubercle. On the front paws of such turtles, there are five fingers with claws. The tail is short and blunt. The head is covered on top with large symmetrical shields. An interesting difference between these turtles are the "spurs" on the back of the thighs.

Mediterranean turtles live in dry steppes, semi-deserts and mountain slopes covered with shrubs, this must be taken into account and added to the “interior” of the terrarium, for example, sprouted cereals, which are also eaten with pleasure by such a turtle. This animal is less "burrowing" compared to the Central Asian, so the layer of soil can be thinner, about 4-5 cm. Such turtles are active only in the morning and evening, at night and in the middle of the day they hide and even burrow.

There are two subspecies - western and eastern, they differ in size, the eastern Balkan tortoise is much larger. The main difference between these animals and their relatives is the conical spike at the tip of the tail, which is also slightly longer than that of other turtles. The high shell of such reptiles is usually 14-16 cm, but in rare cases it reaches 20 cm. In young representatives of this breed, the upper part of the shell is colored brownish-yellow, in adults it darkens, and only a bright yellow border remains along the edge. Adult males are smaller than females, but their tails are longer and thicker.

In nature, the Balkan tortoise lives in dry steppes and shrubs, which should be taken into account when creating conditions for it to live in captivity. A very important factor for a comfortable existence is the humidity of the air and soil in the terrarium; drinking water. Such turtles are very active, in spring, summer and autumn, in the mornings and evenings, they move around their territory in search of a stranger. Balkan tortoises tend to live together, they even climb on top of each other, forming a pyramid, while the males like to "show things off" by entering into a fight.

The Egyptian or Kleimann tortoise is the smallest of them all. land turtles. Its size is a maximum of 14 cm, while the length of the shell itself is 9-10 cm long. Males are slightly smaller than females. The carapace is very convex yellow-green in color with a black stripe along the edges of the segments. There are black spots on the abdominal shields, such turtles have five toes with claws on their front paws.

The Egyptian tortoise is also original in its way of life. Unlike most turtles, it is active in winter and hibernates in summer. This is due to the fact that in the summer in the homeland of Egyptian turtles there is intense heat, which they do not tolerate well. These animals prefer a diurnal lifestyle, they can be kept in several pieces in a terrarium. These reptiles live on average up to 30 years.

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Slides captions:

Mathematics teacher GBOU Lyceum No. 126 of St. Petersburg Gudkova Olga Viktorovna Multiplication and division of decimal fractions

Repetition What is decimal notation for fractional numbers? What are the digits of decimals? What are the rules for adding (subtracting) decimal fractions What are the rules for multiplying decimal fractions What are the rules for multiplying decimal fractions by 10, 100, ...; on 0 , 1 ; 0.01; …

Oral calculations 3.08 + 0.2 2.54 + 0.06 8.2 - 2.2 6 - 0.02 4.7: 10 0.48: 4 0.9: 100 25.5: 25 0, 8:16

The following task will help you find out who is hiding under such an unusual name. 10 12.5 50 0.8 4000 1 0 100 0.1 0.008 0.5 0.008 40 1 0 1 B E P A X A 0 0.5 1 0.008 40 1.125 0.01 0.1 X R A E P E A H 100 × ? = Dermohelis ̶ what is it?

Dermohelis turtles live up to 200 years in the Pacific Islands. They are so large that children can ride on their shells. This turtle swims perfectly, its limbs have turned into flippers. Jewelry is made from the shell, and eggs and meat are eaten. How much does one such turtle weigh? It turns out that if this number is increased by 0.024, and then 3.227 is subtracted from the product, then 11.173 will be obtained. Let's solve this problem. Let x kg be the mass of the turtle. 0.024x - 3.227 \u003d 11.173, 0.024x \u003d 14.4, X \u003d 600. Answer: 600 kg.

Calculate the value of the expression: a) 5.6 2 - 3.2 2 \u003d b) (5.6 - 3.2) (5.6 + 3.2) \u003d 31.36 - 10.2 \u003d 21.12 2, 4 8.8 = 21.12 What did you notice? Write the equation in literal terms. a 2 - b 2 \u003d (a + b) (a - b) Find the sum of the numbers: 0.1 + 0.2 + 0.3 + ... + 1.8 + 1.9 + 2

(5.8 + 20)m 5.8m P = 2 × (a + b) P = 2 × (27, 5 + 25, 8) = 2 × 50.3 = 106.6 (m) (7.5 + 20)m Problem. Find the length of the fence surrounding a rectangular house, if the length of the house is 7.5 m, the width is 5.8 m, and the fence is placed at a distance of 10 meters from the house 7.5 m

Independent work 1) Calculate: 2.7 12 + 9936: 1000: 4.6 - 25.22: 26 2) Solve the equation: 21.87 - 323.91: x + 8.74 = 12.9

Answers 33.59 X=18.3

On the topic: methodological developments, presentations and notes

Objectives: To summarize the studied material. To consolidate the knowledge, skills and abilities of adding and subtracting decimal fractions in the course of solving problems. Expanding interdisciplinary connections in the process of studying te...

This presentation is intended as an accompanying material for the first lesson of the study of the topic "Addition and subtraction of decimal fractions" in grade 5 ...

1. Palettes are superimposed on the figures. Calculate approximately the areas of these figures if the area of ​​each cell is 1 square. units

2. Put tracing paper on checkered paper and make a palette (e = 1 cm 2). Draw some closed line on a sheet of paper and find approximately the area of ​​the figure bounded by this line.

3. Use a compass to draw a circle with a radius of 4 cm and use a palette to find the approximate area of ​​the resulting circle.

4. Quiz "I want to know everything."

a) Giant tortoises live on the islands of the Pacific Ocean. They are of such size that children can ride while sitting on their shell. Decipher the name of the largest turtle in the world by arranging the answers of the examples in descending order and matching them to the corresponding letters.

b) This turtle is an excellent swimmer, its limbs have turned into flippers. Find the mass of the giant tortoise in kilograms by adding the sum of the roots of the two equations:

(x 6 - 956): 4 = 70 and 328 - (y + 6): 4 = 228.

c) Express the mass of the turtle in centners, in grams. What other units of mass do you know?

Lyceum / 2007 academic year Teacher Rudakova T.F. Saratov 2007

Quiz "I want to know everything" Giant turtles live on the islands of the Pacific Ocean. They are so large that children can ride on their shells. To decipher the name of the world's largest turtle, solve the given examples and arrange the answers in descending order. E) :67; D) :42; C) 18450:246; X) 30240:63; M) 38640:48; P) 51750:25; I) 7912:86; L): 729; O) 24325:35 E) :328 DERMOCHELIS

At the blackboard: X: 3 - 71 \u003d 32 X: 2 \u003d 32 + 71 X: 2 \u003d 103 X \u003d 103 * 2 X \u003d: 2-71 \u003d 32 32 \u003d 32 Answer: 206 Independently: (Y + 6): 4 =100 Y+6=100*4 Y+6=400 Y=400-6 Y=394 (394+6):4= =100 Answer: =600 Express the mass of the turtle in c., grams: 600 kg=6c. , 600kg=g.

Solution of Problem 207 From cities A and B, located at a distance of 185 km from each other, two cars left simultaneously in opposite directions. One of them at a speed of 95 km/h, the other 90 km/h. At what distance from each other will these cars be 6 hours after the start of movement?

Problem analysis: Is it possible to immediately answer the question of the problem? Which car and why will it cover a greater distance? Solving the problem at the blackboard with an expression. Task transformation. So what is the distance between the cars? (how far the CMs have retired) On the moving diagram, make a new condition. How much longer will cars travel?