Maths Formulas For Class 8: Important Chapterwise Formulas For Class 8 Maths

Maths Formulas For Class 8: For a Class 8 student, it becomes difficult to understand the rise in difficulty level from his previous classes. Also, for a subject like Mathematics, you got to be attentive all the times. The subject holds a lot of importance in both your education as well as your personal life. For a good level of understanding, you need to conquer your Maths Formulas for Class 8 first and then move on to implement them to solve your questions.
One may wonder where to find the exact Maths formulas for Class 8 for a specific set of problems. This is the reason why we are bringing this article right in front of you. We will be providing you with all Maths formulas for Class 8 under one page so that you don’t face any problem.
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Maths Formulas For Class 8
Many students argue about the fact that Maths formulas are hard to grasp. However, if you understand the meaning of the formulas, practice them regularly, and solve a sufficient number of questions, all the formulas will be at your fingertips.
CBSE Class 8 Maths has the following chapters:
Chapter-1: Rational Numbers
Chapter-2: Linear Equation in One Variable
Chapter-3: Understanding Quadrilaterals
Chapter-4: Practical Geometry
Chapter-5: Data Handling
Chapter-6: Square and Square Roots
Chapter-7: Cube and Cube Roots
Chapter-8: Comparing Quantities
Chapter-9: Algebraic Expressions and Identities
Chapter-10: Mensuration
Chapter-11: Exponents and Power
Chapter-12: Direct and Inverse Proportion
Chapter-13: Factorization
Chapter-14: Introduction to Graphs
Chapter-15: Playing with Numbers
DOWNLOAD NCERT SOLUTIONS FOR CLASS 8 MATHS HERE
Let’s take a look at some of the important chapter-wise list of Maths formulas for Class 8.
Maths Class 8 Formulas: Rational Numbers
Any number that can be written in the form of p ⁄ q where q ≠ 0 are rational numbers. It posses the properties of:
Additive Identity: (a ⁄ b + 0) = (a ⁄ b)
Multiplicative Identity: (a ⁄ b) × 1 = (a/b)
Multiplicative Inverse: (a ⁄ b) × (b/a) = 1
Closure Property – Addition: For any two rational numbers a and b, a + b is also a rational number.
Closure Property – Subtraction: For any two rational numbers a and b, a – b is also a rational number.
Closure Property – Multiplication: For any two rational numbers a and b, a × b is also a rational number.
Closure Property – Division: Rational numbers are not closed under division.
Commutative Property – Addition: For any rational numbers a and b, a + b = b + a.
Commutative Property – Subtraction: For any rational numbers a and b, a – b ≠ b – a.
Commutative Property – Multiplication: For any rational numbers a and b, (a x b) = (b x a).
Commutative Property – Division: For any rational numbers a and b, (a/b) ≠ (b/a).
Associative Property – Addition: For any rational numbers a, b, and c, (a + b) + c = a + (b + c).
Associative Property – Subtraction: For any rational numbers a, b, and c, (a – b) – c ≠ a – (b – c)
Associative Property – Multiplication: For any rational number a, b, and c, (a x b) x c = a x (b x c).
Associative Property – Division: For any rational numbers a, b, and c, (a / b) / c ≠ a / (b / c) .
Distributive Property: For any three rational numbers a, b and c, a × ( b + c ) = (a × b) +( a × c).
Number Formation
A two-digit number ‘ab’ can be written in the form: ab = 10a + b
A three-digit number ‘abc’ can be written as: abc = 100a+10b+c
A four-digit number ‘abcd’ can be formed: abcd = 1000a+100b+10c+d
Download also,
Algebra Formulas For Class 8
Maths Formulas For Class 8: Laws of Exponents
a0 = 1
a-m = 1/am
(am)n = amn
am / an = am-n
am x bm = (ab)m
am / bm = (a/b)m
(a/b)-m =(b/a)m
(1)n= 1 for infinite values of n.
Maths Formulas For Class 8: Algebraic Identity
Algebraic Identities comprises of several equality equations which consist of different variables.
a) Linear Equations in One Variable: A linear equation in one variable has the maximum one variable of order 1. It is depicted in the form of ax + b = 0, where x is the variable.
b) Linear Equations in Two Variables: A linear equation in two variables has the maximum of two variables of order 2. It is depicted in the form of ax2 + bx + c = 0.
(a + b)2 = a2 + 2ab + b2
(a – b)2 = a2 – 2ab + b2
(a + b) (a – b) = a2 – b2
(x + a) (x + b) = x2 + (a + b)x + ab
(x + a) (x – b) = x2 + (a – b)x – ab
(x – a) (x + b) = x2 + (b – a)x – ab
(x – a) (x – b) = x2 – (a + b)x + ab
(a + b)3 = a3 + b3 + 3ab(a + b)
(a – b)3 = a3 – b3 – 3ab(a – b)
Maths Formulas For Class 8 Square & Square Roots
If a natural number, m = n2 and n is a natural number, then m is said to be a square number.
Every square number surely ends with 0, 1, 4, 5 6 and 9 at its units place.
A square mysqladmin is the inverse operation of the square.
Maths Formulas For Class 8 Cube & Cube Roots
Numbers, when obtained while multiplied by itself three times, is known as cube numbers.
If every number in the prime factorization appears three times, then the number is a perfect cube.
The symbol of the cube mysqladmin is ∛.
Cube and Cube mysqladmin: ∛27 = 3 and 33 = 27.
Maths Formulas For Class 8 Comparing Quantities
Discounts are the reduction value prevailed on the Marked Price (MP).
Discount = Marked Price – Sale Price
Discount = Discount % of the Marked Price
Overhead expenses are the additional expenses made after purchasing an item. These are included in the Cost Price (CP) of that particular item.
CP = Buying Price + Overhead Expenses
GST (Goods and Service Tax) is calculated on the supply of the goods.
Tax = Tax % of the Bill Amount
Compound Interest (CI) is the interest which is compounded on the basis of the previous year’s amount.
Formula of Amount (Compounded Annually): \(A = P \left (1 + \frac{R}{100} \right )^t\)
P = Principal,
r = Rate of Interest, and
t = Time Period
Formula of Amount (Compounded Half Yearly): \(A = P \left (1 + \frac{R}{200} \right )^{2t}\)
R/2 = Half-yearly Rate,
2t = Number of Half-Years
Maths Formulas For Class 8 Data Handling & Probability
Any useful information that can be utilized for some specific use is known as Data. These data can be represented either graphically (Pictograph/Bar Graph/Pie Charts) or symmetrically (Tabular form). Find the important Class 8 Maths formulas for Data Handling and Probability.
A class interval is the specific range of numbers such as 10-20, 20-30, 30-40, and so forth.
For a Class Interval of 10-20, Lower Class Limit = 10 and Upper-Class Limit = 20
Frequency is the number of times a particular value occurs.
Probability = Number of Favourable Outcomes / Total Number of Outcomes
Maths Formulas For Class 8 Geometry
Here, we will define the geometrical formulas consistently used in Mathematics Class 8. We will use the following abbreviations for convenience:
1. LSA – Lateral/Curved Surface Area
2. TSA – Total Surface Area
Name of the Solid FigureFormulasCuboidLSA: 2h(l + b)
TSA: 2(lb + bh + hl)
Volume: l × b × h
l = length,
b = breadth,
h = heightCubeLSA: 4a2
TSA: 6a2
Volume: a3
a = sides of a cubeRight PyramidLSA: ½ × p × l
TSA: LSA + Area of the base
Volume: ⅓ × Area of the base × h
p = perimeter of the base,
l = slant height, h = heightRight Circular CylinderLSA: 2(π × r × h)
TSA: 2πr (r + h)
Volume: π × r2 × h
r = radius,
h = heightRight Circular ConeLSA: πrl
TSA: π × r × (r + l)
Volume: ⅓ × (πr2h)
r = radius,
l = slant height,
h = heightRight PrismLSA: p × h
TSA: LSA × 2B
Volume: B × h
p = perimeter of the base,
B = area of base, h = heightSphereLSA: 4 × π × r2
TSA: 4 × π × r2
Volume: 4/3 × (πr3)
r = radiusHemisphereLSA: 2 × π × r2
TSA: 3 × π × r2
Volume: ⅔ × (πr3)
r = radius
CHECK THE DETAILED MATHS SYLLABUS FOR CLASS 8
Maths Formulas For Class 8: Important FAQs
Here are some important frequently asked questions related to Class 8 Maths formulas.
Q: Which book should I prefer for learning Class 8 maths formulas?
A: I advise you to go for NCERT books if you want to know all the important Class 8 Maths formulas.
Is there any website offers free Class 8 practice questions?
A: Embibe offers you with free Class 8 practice questions to learn and score well in your examinations.
Q: How to make the best use of these maths formulas?
A: These Class 8 Maths formulas will help you at the time when you get stuck in some questions while practising the subject. The formulas and properties will help you go through a quick revision. This way you can prepare well and score better.
Q: How will these Class 8 maths formulas help me?
A: These Maths formulas are taken from the standard Class 8 NCERT book. Therefore, it’ll prove useful for you no matter what education board you are studying in. These formulas are present on a page so that you don’t have to go back and forth. Hence, this will come in handy at the time of revision.
SOLVE CLASS 8 QUESTIONS HERE
These are some of the important maths formulas for Class 8. These will prove to be helpful in making your journey a rather easy one. Solve the free Class 8 Maths Questions and refer to these formulas when necessary. With passing time, you will improve.
If you have any queries, feel free to comment them down and we will get back to you. Embibe wishes you all the best!
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Diksha Laniya🐥 5 years ago
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