Secondary School (English Medium) (5 to 8) कक्षा ८ - CBSE Question Bank Solutions

A three-digit number 2 a 3 is added to the number 326 to give a three-digit number 5b9 which is divisible by 9. Find the value of b – a.

Let E = 3, B = 7 and A = 4. Find the other digits in the sum

    B A S E
 + B A L L  
G A M E S

Let D = 3, L = 7 and A = 8. Find the other digits in the sum

 M A D
 +  A S
 +     A   
B U L L  

If from a two-digit number, we subtract the number formed by reversing its digits then the result so obtained is a perfect cube. How many such numbers are possible? Write all of them.

Work out the following multiplication.

12345679
         ×   9
                  

Use the result to answer the following question.

What will be 12345679 × 45?

Work out the following multiplication.

12345679
         ×   9
                  

Use the result to answer the following question.

What will be 12345679 × 63?

Work out the following multiplication.

12345679
        ×    9
                 
Use the result to answer the following question.

By what number should 12345679 be multiplied to get 888888888?

Work out the following multiplication.

12345679
        ×    9
                 
Use the result to answer the following question.

By what number should 12345679 be multiplied to get 999999999?

Find the value of the letters in the following:

 P  Q
 ×   6  
Q Q Q

Find the value of the letters in the following:

    2  L M
+  L M 1  
   M  1  8  

For the following solid, identify the front, side and top views and write them in the space provided.

For the following solid, identify the front, side and top views and write them in the space provided.

For the following solid, identify the front, side and top views and write them in the space provided.

Tell what property allows you to compute `1/3 xx(6xx4/3)` as `(1/3 xx 6) xx 4/3`

Examine the table. (Each figure is divided into triangles and the sum of the angles deduced from that.)

Figure
Side	3	4	5	6
Angle sum	180°	2 × 180° = (4 − 2) × 180°	3 × 180° = (5 − 2) × 180°	4 × 180° = (6 − 2) × 180°

What can you say about the angle sum of a convex polygon with number of sides?

a) 7

b) 8

c) 10

d) n

What is a regular polygon?

Find the measure of each exterior angle of a regular polygon of 9 sides.

Find the measure of each exterior angle of a regular polygon of 15 sides

How many sides does a regular polygon have if the measure of an exterior angle is 24°?

How many sides does a regular polygon have if each of its interior angles is 165°?