How Heavy How Light Class 4 Notes CBSE Maths Chapter 12 [Free PDF Download]

Heavy and Light: 

• The terms “heavy” and “light” are used to indicate the weight of an object. 

• Weight can be defined as the measure of how heavy something is. 

Light Objects: 

• The objects with less weight are called light objects.

• The lighter objects can be lifted easily because of their lightweight.

• Examples of such objects are Feather, Cotton etc

Heavy Objects:

• The objects with more weight are called heavy objects.

• The main property of heavy objects is, that they cannot be easily lifted by a human being usually, with great difficulty they can be lifted.

• Examples of such objects are Iron balls.

Heaviest Objects: 

• The main property of such objects is that it is practically impossible to lift them by an individual 

• The objects with huge weights are called the heaviest objects.

• The weight of your chair is more than the weight of your book and the weight of your bed is more than the weight of your chair. So, We can say that the bed is the heaviest object among chairs, beds and books.

• Examples of such objects are rocks, mountains, buildings etc

Solved Examples 1: List some of the heavy objects and light objects we come across in our daily lives?

Ans: The objects are categorized as “heavy” and “light” based on their weight. Some of the objects “heavy” and “light” around us are:

Heavy Objects:

• Chair

• Table

• Car

• Bricks

• Stones 

• Rocks …etc

Light Objects:

• Cotton

• Peanuts 

• Leaf

• Feather 

• Paper 

• Flower ..etc

Solved Example 2: From the given list of objects categorized them into light, heavy and Heaviest. Door, fan, Building, pen, pencil, rock, table, iron ball, feather, cotton, Electric pole, Mountain

Ans: The trick that can be used here to classify the objects as light, heavy and heaviest is:

• The objects which can be easily lifted are light.

• The objects that cannot be picked easily but still can be lifted with difficulty are heavy.

• The objects which are impossible to lift by humans alone are the heaviest.
  
  

Measurement of Weight:

• Weight of objects is normally measured in Kilograms. 

• Simply, Kilograms can be represented as “kg”. Kg is a standard unit of weight and also is most commonly used in day-to-day practice.

• Weights of Smaller objects are measured in Grams(g) and Milligrams(mg).

• The relationship between Kilogram, Grams and Milligrams is given by 100 gm = 1 kg and 1000 Mg = 1 Kg

• If there are two or more quantities of different weights, the total weight can be found by adding the weights of each quantity.

• The eatables such as Salt, sugar, rice etc are generally measured in Kgs.

Image: Representation of different amounts of weights

Adding Up the Weights:

• The weight of the objects can be added if they have measurements in the same measuring units, such as kg can be added with kg, grams with grams etc.

• If there are different materials says, Sugar 1 kg, salt 2 kg and rice 4 kg and are carried together, the total weight carried would be the sum of all the weights i.e 1 kg + 2 kg + 4 kg = 7 kg

• Note that adding the weights with different units cannot be added directly, say, 2 kg and 4 grams cannot be added.

Solved Examples 1: Sam in a carry bag carries Peanuts weighing 300 mg, Cotton weighing 400 mg and salt weighing 300 mg. Is it true that the total weight of the bag is 1 Kg? 

Ans: There are a total 3 substances in the bag of different weights

Peanuts = 300 gm

Cotton = 400 gm

Salt = 300 gm

To find the total weight of the bag we must add the weight of each of them.

Therefore the total weight = 300 + 400 + 300 = 1000 gm.

We know that 1000 gm = 1 Kg. 

Therefore the total weight of the bag = 1000 gm = 1 Kg

Hence it st true that the total weight of the bag is 1 Kg

Solved Example 2: Pooja goes to the Grocery shop and gives the list to the shopkeeper of the items she wants to purchase which goes as “ 2 Kg rice, 3 Kg daal, 8 Kg sugar and 6 kg wheat. How much weight does she carry from shop to home?

Ans: The items Pooja buys are 

Rice = 2 Kg

Daal = 3 Kg 

Sugar = 8 Kg

Wheat = 6 Kg

The total weight she is gonna carry will be the sum of all the weights which can be given as 

Total weight = 2 Kg + 3 Kg + 8 Kg + 6 Kg = 19 Kg.

Therefore the total weight she is carrying will be 19 Kg.

Weighing Scale:

• To measure the weights of items shopkeepers use a Scale or Balance which has 2 sides one side has weighing stones of different weights and on the other side equal quantity of items is put to balance it out.

• In the post office, depending on the weight of the parcel, the postal rates are charged to the customer.

Solved Examples 1: Santosh sees that a Nimbu weighs 50 gm and an Orange weighs 100 gm which is kept on one side of the Scale. How much Nimbus is required to balance ance the scale?

Ans: It is given that an orange weighing 100 gm is kept on one side of the scale, Now to balance we need 100 gm weight on the other side.

Weight of Nimbu = 50 gm, to make it 100 gm we need 2 nimbu as 

50 gm + 50 gm = 100 gm. 

Therefore we need to put 2 Nimbus on the other side to Balance the Scale.

Practice Questions:

1. Rohan wants to send a parcel of the Math Magic textbook to his friend Rani Chennai. The book weighs 200 g. If the weight of a parcel is more than 50 g he has to pay Rs 6, then the cost for every additional 50 g is Rs 4.

Answers: 18 Rs

2. If 4 friends Arjun weighing 50 Kg, Zain weighing 65 Kg, Yuvi weighing 55 Kg and Zak weighing 75 Kg are driving a car. What is the total weight carried by a car?

Answers: 245 Kg

Importance of CBSE Class 4 Maths Chapter 12 How Heavy How Light

• This chapter will introduce advanced concepts related to heavy light comparisons. Students will learn to judge heavier and lighter objects and give proper answers to the fundamental questions.

• They will also learn different ways to extract information from the illustrated images in the questions.

• The illustration of Dr. Vaidika with proper pictures will explain to students how the young girl manages to measure the weight of an elephant and taught a lesson to the greedy king. This section teaches how the weight of an elephant was calculated by simply using a boat.

• Students will thus find out how scales and balances are used to measure and compare weights from the how heavy how light summary.

• Some questions are framed as puzzles. Students will also have to use their logical reasoning skills to answer such questions.

Benefits of Class 4 Heavy and Light Worksheet and Revision Notes

• The heavy and lightweight concepts have been explained using simpler language, thus students can understand them easily. Our experts have maintained the CBSE standards to elaborate the concepts and problems so that you can understand them easily.

• Solve the heavy and light worksheets and compare your answers to the given solutions. This will help you find out where you need to concentrate more to become better at solving heavy and light questions.

• Learn from the real-life examples explained in the revision notes of this chapter. Find out how you can use your mathematical skills to answer conceptual questions in all the sections.

Studying Heavy and Light Weights Easily with Revision Notes and Worksheets

Solving the how heavy how light Class 4 worksheets by referring to the revision notes will help you complete preparing this chapter perfectly. Sharpen your skills related to weights and units and learn how to extract information from problems by referring to the NCERT Solutions for Class 4 Maths Chapter 12. Download these revision notes and heavy and light worksheet PDF with solutions for better preparation. 

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