CBSE Class 8 Mathematics Practice Worksheet Set D

CBSE Class 8 Mathematics Worksheet (12)

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Class: VIII Subject : Mathematics Assignment No. 2

Square and Square Roots

1. Find the least number of 4 digits which is a perfect square.

2. The area of a square play ground is 477.4225m2. Find the side of the playgroud.

3. Simplify

i) 400 + 0.04 + 0.000004

ii) 212 154 + 225

4. If 4096 = 64 then find the value of 40.96 + 0.4096 + 0.004096

5. Find the square roots of 2304 and 1764 and hence find the value of

0.2304 0.1764

0.2304 0.1764

−

+

6. Find the smallest number which should be added to 3645 to make it a perfect square.

Cube and Cube Roots

1. Find the values of i) 33375 × 729 ii) 3 0.000064

2. Write in the simplest form i) 3 3 6 12 125x y z ii) 3

3

18

729b

216a

3. If 3

3

1000

x

0.512

= , then find the value of x .

4. Simplify: i) 3 − 27000 ii) 3 0.001 10

×

Playing with numbers

1. If a 3 digit number 5x2 is divisible by 3. Find the smallest value of x.

2. If a 4 digit number 13y1 is divisible by 3. Find the smallest value of y.

3. If a 4 digit number 24x5 is divisible by 9. Find the smallest value of x.

OPERATIONS ON ALGEBRIC EXPRESSIONS

1. Re-arrange suitably and find the sum of the following:

a)

11 17 11 25

12 3 2 2

− −

+ + +

b)

4 5 8 9

13 8 13 13

− −

+ + +

2. Evaluate:

12 7 3 1 1

5 20 14 7 10

− − −

+ + + +

3. Simplify:

3 5 9 4 5 6

x x x

11 6 12 3 13 15

− +

4. Multiply

+ −

+ −

9

1

3

2

4

3

1

3

1

2

1 2 3

x

x x by x .

5. Find the product (x3 – 2x2 + 5 ) (4x – 1 )

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