Page 54 - ICSE Math 8

PRACTICE TIME

1. Which of the following are perfect squares?
(a) 7,921 (b) 4,638 (c) 3,844
2. Using a suitable property evaluate the following.
2
2
2
2
2
(a) 35 – 34 (b) 62 – 61 (c) 153 – 152 2
3. Find the square root using the prime factorization method.
(a) 4,624 (b) 3,600 (c) 7,921
4. Find the square root by the long division method.
(a) 3,136 (b) 19,321 (c) 695.9044
5. Find the square correct upto two decimal places.
(a) 42.64 (b) 90.84 (c) 230.40
6. A square room having one side equal to 12 m is to be paved with square tiles of side 50 cm. What is the
number of tiles required to pave the room?
7. Neha walks from her house 160 m north and from there 630 m west to visit her friend’s house. While
coming back, she walks diagonally from her friend’s house to her house. How much distance does she
cover while returning?

8. Two buildings are 20 m and 25 m high. If they are 12 m apart, find the distance between their tops.
9. Aditya is flying a kite which is at a height of 40 m just above a tree. The string is 50 m long. Find the
distance between Aditya and the tree.
10. A fruit seller wants to arrange 676 apples in a large carton such that the number of apples in a row is
equal to the number of apples in a column. Find number of rows of apples in the carton.

THINK SMART

1. A square-shaped floor is covered with 1 square metre floor tiles. If 121 tiles cover the floor, how long is
each side of the floor?
2. You have downloaded a square-shaped digital image of a famous painting from a website. The image
contained 4,90,000 pixels. What is the height of the image in pixels?
(Hint: Pixel dimensions means the height and width of the image.)

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