4th Class

Measurement   Learning Objectives

• Perimeter
• Area

  In previous chapter, we have studied about shapes based on their properties. Perimeter and area are important concepts in our daily life as they widely applied by builders, painters, farmers, and gardeners. Perimeter is the total length of the boundary of a closed shape whereas the space inside the closed shape is its area. In this chapter, we will learn how to estimate and find the perimeter and area of geometrical shapes.  

A plane figure bounded by line segments and composed of angular corners is called a rectilinear figure. For examples, triangle, quadrilateral, hexagon, etc.

 

A circle is not a recti linear figure.

 

Length of the total boundary of a closed figure is called its perimeter.

 

Perimeter of a triangle is equal to the sum of the lengths of all its more...

Data Handling   Learning Objectives

• Introduction
• Data
• Bar Graph
• Line Graph
• Pie Graph

  Introduction Every day we come across a lot of information in the form of numerical figures, tables and graphs. These are provided by newspapers, televisions, magazines and other means of communication. These may relate to cricket batting or bowling average, temperatures of different cities, etc. The graphs are prepared with the help of data. Data are collected through survey or other means. Then data are arranged in ascending or descending order using table. In this chapter, we will study about graphs, how to make the graphs and how to extract information’s contained by the graphs.   Data Collection of information’s in the form of numerical figures in a survey is called data. The initial data that observer collects himself are called raw data. To extract the information’s contained by the more...

Our Body and Health   Interesting Facts

•             Your mouth produces about one litre of saliva each day!
•             A cell takes 24 hours to form and then divide to form new cells.

  ORGANS OF OUR BODY Our body is made up of cells. Cells are the smallest unit of life. Cells, which are similar in structure and function, group together and perform a common function. These group of cells are called tissues. Accordingly, many similar tissues combine together and perform a common function called organ. Eyes, nose, heart, brain, lungs, skin etc., are different organs of more...

Plants and Animals   Plants and animals are found practically everywhere. Some live on land, some under water and some in air. The surroundings where organisms live is called their HABITAT.   Interesting Fact

•            If the spine of barrel cactus accidentally pricks , one may need to take antibiotics to combat its effects

  Do know 

•           There are seven families of conifers. The largest is the pine family

    ADAPTATIONS Adaptations are special features in plants and animals which help them to survive in the habitats they more...

India and the World   We live in a diverse world. There are about 195 countries out of which India is the seventh-largest country in the world. Let us know more about India and the world around us.   Interesting Fact

•            La Tomatina is festival that is held in spain in which participants throw tomatoes and get involved in the tomato fight purely for fun.

    1.            Snow and Ice festival. China - The Harbin festival is the largest snow and ice festival in the world, and it features ice carvings over 20 feet in height and full-size buildings made from gigantic blocks of ice.   2.            Holi more...

Our Earth and Universe   The universe is everything we can touch, feel, sense, measure or detect. It includes living things, plants, star, galaxies, dust clouds, light and even time.   SOLAR SYSTEM The Sun and the eight planets with their moons make up the solar systems. The Sun is at the center of the solar system. All the planets and the smaller objects like comets, asteroids, meteorites, etc., revolve around the Sun. SUN The Sun is a star that emits heat and light. It is the largest member in the solar system. It gives sunlight. Plants need this sunlight to make their food using carbon dioxide, water, chlorophyll and minerals.   Interesting Fact

•           One million more...

Environmental Conservation                  Natural Resources: Nature gives us many things. For example, forest, sun, wind, water, minerals, land, etc. The things that we get from nature is coiled natural resources.   TYPES OF NATURAL RESOURCES 1.            RENEWABLE RESOURES Renewable resources are the resources that are replenished by the environment over relatively short periods of time. Think of this like the ice cube maker in your refrigerator. As you take some ice out. More ice is formed. If you take a lot of ice out. it takes a little more time to refill the tray but not a very long time at all. Even if you completely emptied the ice cube tray, it more...

Science and Technology   Today, we cannot expect our life without science and technology. Science and technology are extremely essential in our everyday life as they have made things more simple, fast and secured. Science and technologies are not only subjects. Rather, they means us ways and objects that help us live a better life!   Interesting Fact

•             The average person walks the equivalent of five time around the world in a lifetime

  MATTER Matter is all around us. Matter is the air you are breathing. Matter is the computer you are reading from now. hotter is the stuff you touch and see. Matter is defined as anything that has mass and takes up space. Matter is more...

Sports   Sports events have played pivotal role in communities around the world. Sports events, specially football world cup, commonwealth game, etc., attract millions of people. Let us know more about some sporting events.   SOME FAMOUS SPORTS EVENTS   1.            Icc World Cup - The ICC Cricket World Cup is the international championship of one -bay International (001) cricket. The event is organized by the sport's governing body, the International Cricket Council (ICC), every four years, with preliminary qualification rounds leading up to a finals tournament. The tournament is one of the world's most viewed sporting events and is considered the "Flagship Event of the International Cricket Calendar" by the ICC. 2.            Pro Kabbadi League - Pro Kabaddi League was conceptualized and founded by Mashal Sports promoted by Anand Mahindra, Charu Sharma more...

Language and Literature   LANGUAGE AND LIERATURE Language is essentially a means of communication among the members of a society. There are roughly 6,500 spoken languages in the know about sone of them.   1.            Chinese- It is the official language of China and Taiwan, as well as one of the four official languages of Singapore. It is one of the six official languages of the United Nations.   2.            Spanish- There are many Spanish speaking countries in the world, as Spanish is the official language of the 20 countries, as well as Puerto Rico, Argentina, Bolivia, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Equatorial Guinea, Guatemala. Honduras, Mexico. Nicaragua. Panama, Paraguay, ...Apr 19, 2017   3.            English- There are more than 50 English speaking more...