Most of the student consider mathematics as a nightmare and math formulas are generally difficult to grasp when you don’t understand them well. The negative attitude towards any of your subjects will make you reluctant to study that particular subject.
Most of the times, student feel nervous during their exams and they are not able to give their best shot. To make you more confident in the study and help you through different concepts in Maths, we will discuss the important math formulas for class 8 here.
When you understand the logic behind each mathematics topics then it would be easier to solve the most complex problems too. For a perfect idea, we will explain you the formulas chapter-wise and we will give you topics how can you score maximum marks in class 8^{th} exams.
Geometry Shapes Formulas for Class 8 | |||
Name of the Solid | Lateral / Curved Surface Area | Total Surface Area | Volume |
Cuboid | 2h(l+b) | \(2\left ( lb+bh+hl \right )\) | \(lbh\) |
Cube | \(4a^{2}\) | \(6a^{2}\) | \(a^{3}\) |
Right Prism | \(Perimeter \; of \; base \times height\) | \(Lateral \; Surface \; Area + 2(Area \; of \; One \; End)\) | \(Area \; of \; Base \times Height\) |
Right Circular Cylinder | \(2\pi rh\) | \(2\pi r \left (r+h \right )\) | \(\pi r^{2} h\) |
Right Pyramid | \(\frac{1}{2} Perimeter \; of \; Base \times \; Slant Height\) | \(Lateral \; Surface \; Area + Area \; of \; the \; Base\) | \(\frac{1}{3}(Area \; of \; the \; Base) \times height\) |
Right Circular Cone | \(\pi rl\) | \(\pi r \left (l+r \right )\) | \(\frac{1}{3}\pi r^{2}h\) |
Sphere | \(4\pi r^{2}\) | \(4\pi r^{2}\) | \(\frac{4}{3}\pi r^{3}\) |
Hemisphere | \(2\pi r^{2}\) | \(3\pi r^{2}\) | \(\frac{2}{3}\pi r^{3}\) |
Algebraic Identities For Class 8 |
\((a+b)^{2}=a^2+2ab+b^{2}\) |
\((a-b)^{2}=a^{2}-2ab+b^{2}\) |
\(\left (a + b \right ) \left (a – b \right ) = a^{2} – b^{2}\) |
\(\left (x + a \right )\left (x + b \right ) = x^{2} + \left (a + b \right )x + ab\) |
\(\left (x + a \right )\left (x – b \right ) = x^{2} + \left (a – b \right )x – ab\) |
\(\left (x – a \right )\left (x + b \right ) = x^{2} + \left (b – a \right )x – ab\) |
\(\left (x – a \right )\left (x – b \right ) = x^{2} – \left (a + b \right )x + ab\) |
\(\left (a + b \right )^{3} = a^{3} + b^{3} + 3ab\left (a + b \right )\) |
\(\left (a – b \right )^{3} = a^{3} – b^{3} – 3ab\left (a – b \right )\) |
Geometric Area | Geometric Area Formula |
Square | \(a^{2}\) |
Rectangle | \(ab\) |
Circle | \(\pi r^{2}\) |
Ellipse | \(\pi r1\: r2\) |
Triangle | \(\frac{1}{2}bh\) |
The first step how to start your study in 8^{th} class is checking the complete syllabus and where to start to ease out the preparation. The class 8^{th} is a very crucial stage in your life where students learn the maximum number of concepts for different subjects and apply them later for real-life applications too. This is the right time to make a foundation for future studies.
To prepare for class 8^{th} exams, you first check the complete syllabus from NCERT book and chapter-wise weight age. Spend more time on the topics having high weight age of marks. Obviously, your class teacher also helps you at every stage but don’t forget to prepare your own strategy and work on the same norms. Before we move ahead, here is a quick look at chapter-wise marks in exams for class eighth.
Maths play a vital role in preparing you for the competitive exams and higher studies too. As we know that CBSE board has changed the curriculum for class 8^{th} after many years. So, this is necessary for you to understand the different topics and their weight age as discussed earlier. Also, you should be mentally prepared how to score well in the exam with the right strategy. Here, we will discuss the tips that will be helpful for you for exams and score well as needed.