CBSE Revision Notes

CBSE Notes for Direct and Inverse Proportions Class 8 Extra Questions

The value of a variable is not constant and keeps on changing. There are many quantities whose value varies as per the circumstances. Some quantities have u relation with oilier quantities such that when one changes the other also changes. Such quantities are inter-redated. This is gilled a variation. Variation is of two types: (i) Direct variation and (ii) Inverse variation. Please refer Direct and Inverse Proportions Class 8 Extra Questions for more information.

CBSE Notes for Exponents and Powers Class 8 Extra Questions

• A number is said to be in the standard Form, if it is expressed as the product of a number between 1 and 10 and the integral power of 10.
• Very small numbers can be expressed in standard form using negative exponents. Pleas refer Exponents and Powers Class 8 Extra Questions for more information.

CBSE Notes for Mensuration Class 8 Extra Questions

Here you can get Class 8 Important Questions Maths based on CBSE Text book for Class VIII. Maths Class 8 Important Questions are very helpful to score high marks in board exams. Here we have covered Mensuration Class 8 Extra Questions.

CBSE Notes for Visualising Solid Shapes Class 8 Extra Questions

Plane shapes have two dimensions (measurements) like length and breadth. That is why they are called two dimensional (2-D) shapes. On the other hand, a solid object having three dimensions like length, breadth, height (or depth) is called 3-D object.

Triangles, rectangles, circles, trapeziums, etc. are 2-D Figures while cuboids, cubes, cylinders, spheres, etc. are 3-D objects. A solid is bounded by one or more surface and it always occupies some space. Its surface (or face) can be a plane or a curved surface. When any two faces of a solid meet together, we get a line segment called an edge. When three more faces of a solid meet at one point, then the point is called a vertex of the solid. Please refer Visualising Solid Shapes Class 8 Extra Questions for more information.

CBSE Notes for Algebraic Expressions and Identities Class 8 Extra Questions

• Algebraic expressions are expressions formed from the variables and the constants. A variable can take any value. The value of an expression changes with the value chosen for variables it contains.
• A number line has infinite number of points. A variable can take position on number line.
• Expressions containing one, two or three terms are called monomial, binomial and trinomial respectively.
• Any expression having one or more terms is called polynomial.
• A monomial is obtained on multiplying any monomial with another monomial.
• The numerical factor of a term is called its coefficient.
• An identity is a standard equality which is true for all the values of the variables in the equality. Please refer Algebraic Expressions and Identities Class 8 Extra Questions for more information.

CBSE Notes for Comparing Quantities Class 8 Extra Questions

• S.P. is selling price
• C.P. is cost price
• The overhead expenses are a part of CP
• Profit or loss is always calculated on CP
• For profit, SP>CP and for loss CP>SP
• Discount is always calculated on the marked price.
• VAT is not a part of selling price. Although it is calculated on the SP but it is excluded from the SP while calculating profit or loss. Please refer Comparing Quantities Class 8 Extra Questions for more information.

CBSE Notes for Cubes and Cube Roots Class 8 Extra Questions

1.   When we multiply a number by itself three times, the product so obtained is called the perfect cube of that number.
2.   There are only 10 perfect cubes from 1 to 1000.
3.   Cubes of even numbers are even and those of odd numbers are odd.
4.   The cube of a negative number is always negative.
5.   If the digit in one place of a number is 0, 1, 4, 5, 6 or 9, then its cube will end in the same digit.
6.   If the digit in one place of a number is 2, then its cube will end in 8 and vice-versa.
7.   If the digit in one place of a number is 3, then its cube will end in 7 and vice-versa.
8.   If the prime factor of a number can not be made into groups of 3, it is not a perfect square. Please refer Cubes and Cube Roots Class 8 Extra Questions for more information.

CBSE Notes for Squares and Square Roots Class 8 Extra Questions

• The Square root of an even perfect square is even and that of an odd Perfect square is odd.
• 2.   Since there is no number whose square is negative the square root of a negative number is not defined.
• 3.   If a number ends with an odd number of zeroes, then it cannot have a square root which is a natural number.
• 4.   If the units digit of a number is 2, 3, 7 or 8 then square root of that number (in natural numbers) is not possible.
• 5.   If m is not a perfect square, then there is no integer n such that square root of m is n. Please refer Squares and Square Roots Class 8 Extra Questions for more information.

CBSE Notes for Data Handling Class 8 Extra Questions

For data to be useful, it is very important to collect complete, accurate & relevant data.After collection of data, it is necessary to represent data in a precise manner so that it is easily understood. Representation of data in a visual manner is known as its Graphical Presentation or simply, Graphs. Data can also be presented in the form of a table; however a graphical form is easier to understand.

Consider the family of Mr. Khanna. They are very fond of eating ice-creams. Some like butterscotch, some like vanilla flavor, some like strawberry and the rest of them likes chocolate. Some demand cones & some of them demand cups. A child of VIII class decides to construct the graphs according to their amount of icecreams consumed. There are 7 ways of representing the data. Please refer Data Handling Class 8 Extra Questions for more information.

CBSE Notes for Practical Geometry Class 8 Extra Questions

Class 8 Practical Geometry NCERT Solutions and Exemplar Problem Solutions, also download free worksheets and assignments with important questions, get MCQs and get free concept notes and RS Aggarwal solutions. Access all study material free and download in pdf prepared based on latest guidelines, term examination pattern and blueprint issued by CBSE . Please refer Practical Geometry Class 8 Extra Questions for more information.