# Category: NCERT Class 8 Maths Notes

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### CBSE Class 8 Maths Chapter 16 Notes Playing with Numbers

CBSE Class 8 Maths Chapter 16 Notes Playing with Numbers Playing with Numbers Class 8 Notes Conceptual Facts 1. Generalised form of a two-digit number if a is ten place digit and 6 is unit place digit. a x 10 + b x 1 = 10a + b 2. Generalised form of a three-digit number…

### CBSE Class 8 Maths Chapter 15 Notes Introduction to Graphs

CBSE Class 8 Maths Chapter 15 Notes Introduction to Graphs Introduction to Graphs Class 8 Notes Conceptual Facts XOX’ and YOY’ taken together are called coordinate axes. The plane containing the coordinate axes is called cartesian plane. The point of intersection of the coordinate axes is called origin. The x-coordinate is always written before y-coordinate…

### CBSE Class 8 Maths Chapter 14 Notes Factorisation

CBSE Class 8 Maths Chapter 14 Notes Factorisation Factorisation Class 8 Notes Conceptual Facts Prime factors of 30 (say) = 2 x 3 x 5 Factors of algebraic expression 4xy = 4 x x x y 1 is a factor of every expression. Method of common factors 4x + 24 = 4(x + 6) Method…

### CBSE Class 8 Maths Chapter 13 Notes Direct and Indirect Proportions

CBSE Class 8 Maths Chapter 13 Notes Direct and Indirect Proportions Direct and Indirect Proportions Class 8 Notes Conceptual Facts 1. The two quantities are said to be directly proportional if an increase in one leads to a corresponding increase in the other. a decrease in one leads to a corresponding decrease in the other.…

### CBSE Class 8 Maths Chapter 12 Notes Exponents and Powers

CBSE Class 8 Maths Chapter 12 Notes Exponents and Powers Exponents and Powers Class 8 Notes Conceptual Facts A numeral (a)n is called an exponential expression where a is called base and n the exponent or power. an = a x a x a x a……… x a (n times) A negative rational number raised…

### CBSE Class 8 Maths Chapter 11 Notes Mensuration

CBSE Class 8 Maths Chapter 11 Notes Mensuration Mensuration Class 8 Notes Conceptual Facts 1. Area of rectangle A = Length x Breadth = a x b sq. units 2. Area of square A = (side)2 = a2 sq. units 3. Area of triangle A = $$\frac{1}{2}$$ x b x h sq.units 4. Area of…

### CBSE Class 8 Maths Chapter 10 Notes Visualising Solid Shapes

CBSE Class 8 Maths Chapter 10 Notes Visualising Solid Shapes Visualising Solid Shapes Class 8 Notes Conceptual Facts 3-D figures: Any shape which occupies space and has three dimensions, i.e., length, breadth and heights is called 3-D solid or a figure. Parts of a solid objects: Face Vertex Edge Types of Solids: (i) Prism: (ii)…

### CBSE Class 8 Maths Chapter 9 Notes Algebraic Expressions and Identities

CBSE Class 8 Maths Chapter 9 Notes Algebraic Expressions and Identities Algebraic Expressions and Identities Class 8 Notes Conceptual Facts 1. Algebraic Expression: A combination of numbers which includes literal number connected by the symbols +, -, x and + is called an algebraic expression. For example: 5x, 8x -3, 2x + 3y, $$\frac{3}{4}$$x2 4xyz…
CBSE Class 8 Maths Chapter 8 Notes Comparing Quantities Comparing Quantities Class 8 Notes Conceptual Facts 1. In every hundred or per hundred is called as percent. For example: 30% means 30 in every hundred. To change a percentage to a fraction: 40% $$\frac{40}{100}$$=0.4 , 125% = $$\frac{125}{100}$$=1.25 2. Percentage increase and decrease Increase 240…