ICSE Class 9 Mathematics Revision Notes

No one can avoid the significance of revision. As a fact, the majority of Class 9 students work hard on it but don't always get success. Students need to plan their advance revisions, so they don't miss on any important concept. Just reading notes constantly without understanding them won't help students in improving their thinking ability. Subjects like Maths require a thorough comprehension and revision of crucial formulas and facts. Here at Vedantu, we have created revision notes for maths that covers all important concepts, formulas, facts based on the ICSE curriculum. We have presented them in the most precise manner so students can understand things better.

Our ICSE Class 9 Maths notes help in the following ways:

• It saves students from last-minute revision and cramming.

• It helps students in understanding concepts in depth in a short period.

• It creates an optimum learning environment.

• By practising questions on crucial topics, students understand essential points in a better way.

• Revision notes reduce the chances of forgetting concepts.

• Increases study attention.

• Helps to train the brain so it can digest more information and store it for a longer time. 

• Improves summarising and retaining capacity.

• Enable students to finish their learning tasks on time. 

• Help in learning and revising those concepts only that are important from the exam point of view. 

• The notes are available in PDF format that lets students carry them at school lectures, lab practicals, coaching classes, etc. 

• Explain concepts with relevant examples and diagrams. 

When should Class 9 Students study Maths Revision Notes?

Students should not crame for hours just before the examinations. We all know that revision works better when done for shorter time durations at regular intervals. According to a survey, it is found that students prefer revising concepts from their textbooks or highlighted texts from reference books. This doesn't improve their performance, instead it wastes their precious time. Revising notes for 20 to 30 minutes regularly and following them up with solving some Math problems boosts scores considerably.

Students are advised to make a study schedule that allocates some time for revising Maths notes on a daily and weekly basis. Naturally, students feel a rush when the exam approaches, and they try to step into all chapters within a single period of time. To prevent this situation, our chapter-wise Maths revision notes help Class 9 kids to revise all the necessary information before any exam or unit test.

ICSE Class 9 Maths Chapters That can't be Ignored 

Many students think that some ICSE Maths Chapters are not important to study. But, it's not true. Well, the fact is that some chapters are significant for the exam and some are not. Here we have listed some chapters that carry more weightage and can not be missed. 

The names of the chapters are as follows. 

• Commercial Maths

Includes concepts related to compound interest. It has a compound interest without formula and with formula. 

Without formula compound interest deals with problems related to simple interest. Whereas, with formula compound interest deals with problems based on its formula. 

 Algebra

1. Linear Equations- This is an easy to score chapter. However, students should plot points correctly to get full marks. 

2. Logarithms- Students can use the concepts of logarithms to solve various equations and expressions. 

 Statistics

This unit has a heavy weightage, and students can score easily in this. From this unit, questions are asked on mean, mode and median. So, students should not skip it. 

Selina Maths Class 9 Chapter-Wise Revision Plan

Textbooks by Selina publications are among the most recommended books suggested by experts for Class 9 students. It is easy to learn and revise all the essential concepts from a Selina textbook. Showing a necessary step while solving a problem carries marks in the exam. If you miss the vital steps in answers, you lose marks. While practising Selina textbooks, you get a habit of completing all the essential steps while solving a problem. It helps in gaining confidence over the concepts of the syllabus. Moreover, it helps you in clearing the ideas which are useful in competitions like Olympiads. Selina textbooks also provide revision notes, which maximises the exam preparation and helps in getting a top score in Class 9 final exam.

Solved Examples

 1. Rs. 15000 is lent at compound interest for two years. The rates for the years are 8% p.a. and 10% p.a. respectively. Calculate the amount.

Solution:

Given: 

P = Rs. 15000

N = 2 years

R1 = 8% and R2 = 10%

Amount = P × (1 + R1 / 100) × (1+ R2 / 100)

Amount = 15000 × (27 / 25) × (11 / 10)

Amount = Rs. 17,820

2. The length of the sides of a triangle are in the ratio of 3:4:5. The perimeter of the triangle is 144 cm. Calculate its area.

Solution: Let the sides of the triangle be 

A = 3x

B = 4x

C = 5x 

Given that the perimeter is 144 cm.

3x + 4x + 5x = 144

12x = 144

x = 144/12

x = 12

s = a+b+c / 2 = 12x / 2 = 6x = 72

Therefore, the sides are 36 cm, 48 cm, 60 cm, which are a, b and c respectively.

Thus, the area of the triangle according to the formula is

= square root ( 72 × (72-36) × (72-48) × (72-60) )

= square root ( 746496 )

= 864 cm²