4th Class

LEARNING OBJECTIVES This lesson will help you to:—

• understand two dimensional and three dimensional geometrical figures.
• learn about line symmetry, symmetrical and asymmetrical shapes.
• determine the number of line of symmetry.
• identify the different types of triangles on the basis of sides and angles.
• understand the different kinds of angles.
• learn about the angle sum properties of triangle and quadrilateral.
• Know about the terms related to the circle.

  QUICK CONCEPT REVIEW Circle

• A circle is a closed figure formed by points equidistant from a fixed point.
• Every circle has a fixed centre.
• The perimeter of the circle is called its circumference
• The distance between the centre and any point on the circle is called its radius.

A line segment passing through the centre of the circle, whose end points lie on the circle is called the diameter of the circle.   more...

LEARNING OBJECITVES This lesson will help you to:–  

• revise standard units of length like millimeter, centimeter and meter.
• choose appropriate standard unit of length.
• measure objects using standard unit of length. convert meter into centimeter.
• introduce standard units of weight like gram (gm) and kilogram (kg).
• choose appropriate standard unit of weight.
• weigh objects ' Jing standard units.
• convert the units of weight.
• introduce standard units of volume like litre (It).
• choose appropriate capacity of a container using standard unit of volume.
• convert the units of volume.

  Real Life Example:

• Carpenter use measuring tapes to measure length of wooden furniture in order to construct them.
• Meters (m) are widely used in various races like car race, bicycle race etc.
• Knowledge of length helps us to construct rooms and buildings.
• Fruit sellers and vegetable sellers use weighing balance to weigh fruits and vegetables.
• Doctors weigh their patients more...

LEARNING OBJECTIVES This lesson will help you to:—

• study about the concept of decimals.
• study about the conversion of a fraction into a decimal.
• learn to compare the fractions.
• study about the basic mathematical functions of decimals.

  Real Life Examples One of the most instances will be money! Whenever we have some numbers of cents that do not add up to a full dollar, we express the amount as a decimal. For example $3.75, $12.69, and even $100 are all examples of decimals.   QUICK CONCEPT REVIEW What are decimals?

• Decimals are also a way of expressing whole numbers like fractions and percentage.
• Decimals are used in situations which require more precision than whole more...

LEARNING OBJECTIVES This lesson will help you to:—

• learn to identify half, one-fourth and three-fourth of a whole.
• learn and understand the meaning of 1/3, /4 and 2/3.
• learn to appreciate the equivalence of 2/4 and 1/2 and of 2/2, 3/3 and 4/4 and 1.
• study about the numerator and denominator of a fraction.
• learn about mixed fractions.
• study about addition and subtraction of fractions.

  Real Life Examples Sharing food is a good way to introduce various concepts about fractions. For example, using a chocolate bar and dividing it into pieces. Measurements during baking uses fractions such as one fo0urth of a cup of milk or half a spoonful of sugar etc.   QUICK CONCEPT REVIEW Whole Number: Whole Numbers are simply the numbers 0, 1, 2, 3, 4, 5... (and so on).They're not fractions, they are not decimals, they are simply whole numbers. more...

Money LEARNING OBJECTIVES This lesson will help you to:—

• overview of money and its use.
• convert Rupees to Paise.
• analyze situations to enable addition, subtraction, multiplication and division of money.
• enable a child to count the money.
• uses operations to find totals, change, multiple costs and unit cost.
• estimates roughly the totals and total cost.
• real life examples to help in better understanding of rupees and paisa.

 Real Life Examples You and your friends go to bakery to purchase a cake and give money to shopkeeper. If you do not have exact amount as is the cost of cake then shopkeeper will give change back. You were given several coins and paper notes of different denominations and you are being asked to count the total money present.  Historical Preview In ancient days before money was invented, the barter system was used. Barter is a system of more...

Time and Calendar LEARNIN OBJECTIVES This lesson will help you to:—

• learn about measurement of time (hour and minutes).
• identify the duration of day and night.
• study calendar with dates and days.
• express time, using the terms, ‘a.m.’ and ‘p.m.’

  Historical Preview In ancients times people used to tell the time by watching the position of sun in the sky. They invented Obelisks (slender, tapering, four-sided monuments) which were built as early as 3500 B.C. Obelisks were special because they used moving shadows to tell about the time. Later on Egyptians modified it and made Sundials.   QUICK CONCEPT REVIEW Don't we talk about time all the time like: Time to take a bath. Time to eat food. Time to sleep. Wake up time. So, “What is time?” Just like you have length to measure your garden, height to measure how tall you are, weight for the more...

LEARNING OBJECTIVES This lessen will help you to:—

• understand the concept of factors.
• understand the concept of multiples.
• use factor tree to find the factors of a number.
• to find prime numbers, factors and multiples of given number.
• to apply factors and multiples to real life situations.

  Amazing Fact A number’s composite factors are found by multiplying 2 or more prime factors. For example: The composite factors of \[18\left( 2\times 3\times 3 \right)\]are\[6\left( 2\times 3 \right)\]and\[9\left( 3\times 3 \right)\]   Real Life Example Money can use the concept of factors. One can exchange a 100 – Rupee by two 50 – Rupee notes (factors 2 and 50) or five 20 – Rupee note (factors 5 and 20). more...

LEARNING OBJECTIVES This lesson will help you to:—

• divide one number by another.
• be able to solve real life problems based on division.
• explore various facts of division.
• be able to define the terminology of division.
• be able to explain the properties of division.

  Real Life Example Division is used in almost and every sphere of our life. Division is used in daily household activities, shopping in a mall, eating pizza etc.   QUICK CONCEPT REVIEW   What is DIVISION? Division is splitting into equal parts or groups. It is the result of "fair sharing". When we share equally we divide. Symbolically, we write it as follows; more...

This lesson will help you to:—

• be able to recognize & learn numbers larger than lakh.
• be able to understand the place value chart.
• be able to identify ten lakh.
• be able to understand the real life applications of large numbers.

  Real Life Examples We are surrounded by numbers in each & every sphere of our life. Large numbers are often used in monetary transactions in businesses, banks etc. Total number of schools in a city, total numbers of students in a big school is all examples of large numbers.   QUICK CONCEPT REVIEW Large Numbers A census officer visited Rohan's home. He was confused why she is asking so more...

Roman Numerals *-answer-* LEARNING OBJECTIVES This lesson will help you to:—

• be able to know the history & use of roman numerals.
• be able to solve real life problems based on roman numerals.
• explore various principles of roman numerals.
• be able to define roman numerals.
• be able to convert roman numerals into Arabic numerals and vice versa.

  Real Life Example Roman numbers are used widely in real life. The most important & common example is watches & clocks with Roman numbers on it. Many monuments & buildings engrave numbers in Roman system of numeration. Games & sports also use Roman numbers instead of traditional system of numbering. M’s “mile” (or 1000 said) D’s half (500 – quickly read!) C’s just a 100 (century) And L is half again – 50! So all that’s left is X and V (or 10 and 5) – and I more...