8TH GRADE MATH PRACTICE QUESTIONS

Question 1 :

What is the value of square root of 81? 

(A)  81              (B)  3               (C)  9 

Need solution

Question 2 :

Find the area of a right angled triangle, if the radius of the circumcircle is 5 cm and altitude to the hypotenuse is 4 cm. 

(A)   20 cm2              (B)   10 cm2           (C)   30 cm2

Need solution

Question 3 :

The volume of cubical box is 46.656 cubic meters. Find the length of the side of the cubical box. 

(A)   3.6 m              (B)   5.2 m           (C)   7.8 m

Need solution

Question 4 :

The sum of the digits of a two digit number is 15 and if 9 is added to the number the digits are interchanged. Find the required number. 

(A)  78          (B)   87         (C) 96

Need solution

Question 5 :

In a circle with center O and radius 17 cm, PQ is a chord at a distance of 8 cm from the center. Find the length of the chord. 

(A)  30 cm     (B)  15 cm     (C)  24 cm  

Need solution

Question 6 :

The radius and height of a cylinder are in the ratio 5:7 and its volume is 550 cm³ find its radius.

(A)  5 cm         (B)  6 cm        (C)  7 cm  

Need solution

Question 7 :

The mean weight of 4 boys is 56 kg and that of 6 girls in 46 kg. find the combined mean weight of 10 students.

(A)  40 kg     (B)  36 kg     (C)  50 kg  

Need solution

Question 8 :

The arithmetic mean of 8, 10, x and 12 is 9. Find the value of x. 

(A)  6                (B)   8               (C)   9

Need solution

Question 9 :

Find the number of sides of regular polygon whose exterior angle measure of 45 degree.

(A)  6 sides               (B)   8 sides               (C)   9 sides

Need solution

Question 10 :

Simplify the expressions and evaluate them as directed.

x (x-3) + 2 for x = 1 

(A)  0               (B)  5             (C)  3

Need solution

Answer Key

(1)  9 

(2)  20 cm²

(3)  3.6 m  

(4)  78 

(5)  30 

(6)  5 cm  

(7)  50 kg

(8)  6  

(9)  8 sides

(10)  0

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