List of top Mathematics Questions asked in CBSE Class VIII

Find the number of digits in the square root of each of the following numbers (without any calculation). 
  1. 64 
  2. 144 
  3.  4489 
  4.  27225
  5.  390625
Find the square root of each of the following numbers by division method. 
  1. 2304 
  2. 4489 
  3.  3481 
  4.  529 
  5.  3249 
  6.  1369 
  7.  5776 
  8.  7921 
  9.  576 
  10.  1024 
  11.  3136 
  12.  900
Find the area of a rhombus whose side is 6 cm and whose altitude is 4 cm. If one of its diagonals is 8 cm long, find the length of the other diagonal.
The diagonal of a quadrilateral shaped field is 24 m and the perpendiculars dropped on it from the remaining opposite vertices are 8 m and 13 m. Find the area of the field.
diagonal of a quadrilateral shaped field is 24 m
Find the least number which must be added to each of the following numbers so as to get a perfect square. Also find the square root of the perfect square so obtained. 
  1. 525 
  2.  1750 
  3.  252 
  4.  1825
  5.  6412
Length of the fence of a trapezium shaped field ABCD is 120 m. If BC = 48 m, CD = 17 m and AD = 40 m, find the area of this field. Side AB is perpendicular to the parallel sides AD and BC.
Find the length of the side of a square whose area is \(441 \;m^2\)
In a right triangle ABC, \(∠ B\) = 90°. 
  1. If AB = 6 cm, BC = 8 cm, find AC 
  2.  If AC = 13 cm, BC = 5 cm, find AB
A gardener has \(1000\) plants. He wants to plant these in such a way that the number of rows and the number of columns remain same. Find the minimum number of plants he needs more for this.
The shape of the top surface of a table is a trapezium. Find its area if its parallel sides are 1 m and 1.2 m and perpendicular distance between them is 0.8 m.
Top surface of a trapezium
These are \(500\) children in a school. For a P.T. drill they have to stand in such a manner that the number of rows is equal to number of columns. How many children would be left out in this arrangement?
Which of the following numbers are not perfect cubes: 
  1. 216 
  2. 128 
  3.  1000 
  4.  100 
  5.  46656
Find the smallest number by which each of the following numbers must be multiplied to obtain a perfect cube:
  1. 243
  2. 256
  3.  72
  4.  675
  5.  100
Parikshit makes a cuboid of plasticine of sides \(5\) \(cm\), \(2\) \(cm\), \(5\) \(cm.\) How many such cuboids will he need to form a cube?
Find the square roots of the following numbers by the Prime Factorisation Method. 
  1. 729 
  2. 400 
  3.  1764 
  4.  4096 
  5.  7744 
  6.  9604 
  7.  5929 
  8.  9216 
  9.  529 
  10.  8100
Find the smallest square number that is divisible by each of the numbers \(8, 15\), and \(20\).
Find the smallest square number that is divisible by each of the numbers \(4, 9\), and \(10\).
\(2025\) plants are to be planted in a garden in such a way that each row contains as many plants as the number of rows. Find the number of rows and the number of plants in each row.
The students of Class VIII of a school donated Rs \(2401\) in all, for Prime Minister's National Relief Fund. Each student donated as many rupees as the number of students in the class. Find the number of students in the class.
For each of the following numbers, find the smallest whole number by which it should be multiplied so as to get a perfect square number. Also find the square root of the square number so obtained. 
  1. 252 
  2.  180 
  3.  1008 
  4.  2028 
  5.  1458 
  6.  768
Find the square roots of \(100\) and \(169\) by the method of repeated subtraction.
Without doing any calculation, find the numbers which are surely not perfect squares. 
  1. 153 
  2. 257 
  3. 408 
  4. 441
What could be the possible 'one's' digits of the square root of each of the following numbers? 
  1. 9801 
  2. 99856 
  3. 998001 
  4. 657666025
Write a Pythagorean triplet whose one member is 
  1. 6 
  2. 14 
  3.  16 
  4.  18
Find the square of the following numbers 
  1. 32 
  2. 35 
  3.  86 
  4.  93 
  5.  71 
  6.  46