Important 3 Marks Questions for CBSE 8 Maths

Class 8th CBSE is a very important stage in the development of fundamentals of a student. As the basics of Maths and Science help students to understand complex topics which will come in 9th standard. Most of the subjects in class 8 are vast, where some of them require not only memorization but also requires skill. One such is the subject of Mathematics, which seems to be a nightmare for students and requires a lot of practice to boost confidence. So we at BYJU’S provide students of Class 8 with important 3 marks question, which can be beneficial for them in their examination.

Students preparing for CBSE Class 8th Maths Examination are advised to practice the given question for Mathematics:

Q1) Construct a frequency distribution table for the data on weighs (in kgs) of 20 students of a class using class intervals 30-35, 35-40 and so on.

40, 33, 56, 31, 34, 49, 55, 57, 44, 38, 38, 48, 53, 46, 36, 41, 49 ,42, 47, 39

Q2) The number of employees in a office, speaking different languages is given below. Display the data in a pie chart.








Number of students







Q3) Classify the following polynomials as monomials, binomials and trinomials:

  1. a) \(5xyz^{2}\) – 3zy
  2. b) \(\frac{a}{2}+\frac{b}{2}-ab\)
  3. c) pqr

Q4) Draw the line passing through (2,3) and (3,2). Find the coordinates of the points at which this line meets the x-axis and y-axis.

Q5) Simplify:

\(\left \{ \left ( \frac{1}{3} \right )^{-2}-\left (\frac{1}{2} \right )^{-3} \right \}\div \left (\frac{1}{4} \right )^{-2}\)

Q6) Subtract 3a(a + b – c) – 2b( a – b + c) from 4c (-a + b + c) .

Q7) An electric pole 15m high, casts a shadow of 10m. Find the height of the tree that casts a shadow of 15m under similar conditions.

Q8) A cuboid is dimension 60 cm x 54 cm x 30 cm. How many small cubes with side 6 cm can be placed in the given cuboid?

Q9 ) If 18 workers can build a sloping roof of a building in 48 hours, how many workers will be required to do the same work in 30 hours ?

Q10) Find the compound interest on Rs. 5000 for 2 years at the rate of 10% per annum compounded annually.

Q11) Subtract \(5x^{2}-4y^{2}\) + 16y – 3 from \(7x^{2}-4xy+8y^{2}+5x-3y\)

Q12) The diagonal of quadrilateral shaped field is 24 m and the perpendicular dropped on it from the remaining opposite vertices are 8 m and 13 m. Find the area of the field.

Q13) A machine in a soft drink factory fills 840 pepsi bottles in hours. How many bottles will it fill in 6 hours.

Q14) Divide:

\((7x^{2}+14x)\) by (x + 2)

Q15) A storage place is in the form of a cuboid of measures 60 m x 40 m x 30 m . How many cuboidal boxes can be stored in it, if the volume of one box is \(0.8m^{3}\) .

Q16) Show that:

\((3x+7)^{2}-84x = (3x-7)^{2}\)

Q17) If any object has 20 faces, 12 vertices then find the value of Edges by using Euler’s formula.

Q18) Four fifth of a number is more than three fourth of the number by 4. Find the number.

Q19) Find five rational numbers between \(\frac{-1}{3}\) and \(\frac{1}{3}\)<

Q20) The diagonal of quadrilateral shaped field is 24m and the perpendiculars dropped on it from the remaining opposite vertices are 10m and 15m. Find the area of the field.

Practise This Question

In the pie chart given, what is the percentage of people who like reading? (It can be inferred that the percentage of people who like playing is 38%)