1. Evaluate using identities

A} (a^{2}+b^{2}) (-a^{2}+b^{2})

B} (4x+5)(4x-1)

C} 102^{2}

D} (3x+7)^{2}-84x= (3x-7)^{2}

E} 153^{2}-147^{2}

2. The area of a rhombus is60 cm^{2}.One diagonal is 10 cm. What is the other diagonal?

3. 8 persons can stay in a cubical room. Each person requires 27m^{3} of air. What is the side of the cube?

4. Write the following numbers in standard form:

I) 0.000000564

ii) 0.0000021

iii) 21600000

iv) 15240000

5. A train travels 60 km in 1 hour. How long will it take to go 150 km?

6. 40 cows can graze a field in 16 days. How many cows will graze the same field in 10 days?

**Date of submission: 2 Jan., 2015**