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# Important 3 Marks Questions for CBSE Class 8 Maths

Important 3 Marks Questions for CBSE Class 8 Maths are provided here. Students will learn the fundamentals of Mathematics in Class 8. Learning Class 8 Mathematics is important as it will help them to solve problems easily in the higher classes. 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 questions, which can be beneficial for them in their examination. Also, we provide the important questions for class 8 Maths chapter-wise, so that the students will score better in the final exam.

## Important 3 Marks Questions for CBSE Class 8 Maths for Practice

Practice the below given important 3 marks questions for CBSE Class 8 Maths to score good marks in the examination. Students are advised to practice these important problems repeatedly to write the answers with accuracy and also it will help them to manage the time as well, during the examination.

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.

 Language Hindi English Marathi Tamil Bengali Total Number of students 30 12 9 7 4 62

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

1. a)
$$\begin{array}{l}5xyz^{2}\end{array}$$
– 3zy
2. b)
$$\begin{array}{l}\frac{a}{2}+\frac{b}{2}-ab\end{array}$$
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:

$$\begin{array}{l}\left \{ \left ( \frac{1}{3} \right )^{-2}-\left (\frac{1}{2} \right )^{-3} \right \}\div \left (\frac{1}{4} \right )^{-2}\end{array}$$

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

$$\begin{array}{l}5x^{2}-4y^{2}\end{array}$$
+ 16y – 3 from
$$\begin{array}{l}7x^{2}-4xy+8y^{2}+5x-3y\end{array}$$

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:

$$\begin{array}{l}(7x^{2}+14x)\end{array}$$
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

$$\begin{array}{l}0.8m^{3}\end{array}$$
.

Q16) Show that:

$$\begin{array}{l}(3x+7)^{2}-84x = (3x-7)^{2}\end{array}$$

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

$$\begin{array}{l}\frac{-1}{3}\end{array}$$
and
$$\begin{array}{l}\frac{1}{3}\end{array}$$
<

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.

Q21) A shopkeeper purchased 300 bulbs for Rs.12 each. However, 5 bulbs were fused and had to be thrown away. The remaining bulb was sold in Rs.15 each. Find his gain and loss per cent.

Q22) A shopkeeper buys 90 articles for Rs.2700 and sells them at a profit of 18%. Find the selling price of one article.

Q23) Using the laws of exponents, evaluate the following: (2)-3 x (1/6)-3 x (10 + 20 + 30)-2

Q24) The cost of the sewing machine is Rs. 7000. Its value depreciates at 8% per annum. Find the value of the machine after 2 years.

Q25) Suppose 5kg of sugar contains 5 x 107 crystals. How many sugar crystals are therein: 2 kg of sugar and 1.2 kg of sugar?

Q26) The diagonal of a quadrilateral shaped field is 24m and perpendicular dropped on it from the remaining opposite vertices are 10m and 15m. Find the area of the field.

Q27) Find the area of a rhombus whose is 6cm and altitude is 4cm. If one of its diagonal is 8cm long, then find the length of another diagonal.

Q28) Show that: (9p – 5q)2 + 180 pq = (9p+5q)2

Q29) Show that: (2.5p – 1.5q)2 – (2.5p+1.5q)2

Q30) Factorise: p4-81.

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