Welcome to your 08 math

1. 
√0.04 = ?
2. 
1 hectare =________ sq m
3. 
A perfect square number having n digits where n is even will have square root with
4. 
If the diagonals of a rhombus get doubled, then the area of the rhombus becomes_______its original area.
5. 
The dimensions of a plot are 300 m x 250 m. A builder builds 3 roads which are 3 m wide along the length on either side and one in the middle. On either side of the middle road he builds houses to sell. How much area did he get for building the houses?
6. 
The cube of a number x is 16 times of x then find x ______________
7. 
A retailer buys some silk scarves for Rs. 460 and sells them at 60% profit. For how much does he sell them?
8. 
A room is 12m long, 8 m broad and 4m high. What will be the area of four walls?
9. 
The one’s digit of the cube of 23 is
10. 
Find the area of a square park whose perimeter is 440 m, Also find the cost of growing grass on it at the rate of ₹ 2.15 per sq. m?
11. 
Find the greatest number of three digits that is a perfect square.
12. 
The dimensions of a godown are 40 m, 25 m and 10 m. If it is filled with cuboidal boxes each of dimensions 2 m × 1.25 m × 1 m, then the number of boxes will be
13. 
The ratio of radii of two cylinders is 1: 2 and heights are in the ratio 2:3. The ratio of their volumes is
14. 
Three cubes each of side 10cm are joined end to end. Find the surface area of the resultant figure
15. 
A carpet of size 5 m x 2 m has 25 cm wide red border. The inner part of the carpet is blue in colour (see the figure). What is the ratio of areas of red portion to blue portion?
16. 
Find the shaded area
17. 
A student multiplied a number by 2/5 instead of 5/2. What is the percentage error in the calculation?
18. 
If two cubes of sides 7 cm each are joined end by end then the surface area of cuboid will
19. 
Find the value of 45% of 280 + 28% of 450
20. 
Find the value of