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

Add the following:

l² + m², m² + n², n² + l², 2lm + 2mn + 2nl

Subtract: 4a − 7ab + 3b + 12 from 12a − 9ab + 5b − 3

Subtract 3xy + 5yz − 7zx from 5xy − 2yz − 2zx + 10xyz.

Subtract 4p²q − 3pq + 5pq² − 8p + 7q − 10 from 18 − 3p − 11q + 5pq − 2pq² + 5p²q

The diagonals of a rhombus are 7.5 cm and 12 cm. Find its area.

Find the area of a rhombus whose side is 5 cm and whose altitude is 4.8 cm. If one of its diagonals is 8 cm long, find the length of the other diagonal.

The floor of a building consists of 3000 tiles, which are rhombus shaped, and each of its diagonals are 45 cm and 30 cm in length. Find the total cost of polishing the floor if the cost per m² is ₹ 4.

Mohan wants to buy a trapezium shaped field. Its side along the river is parallel to and twice the side along the road. It the area of this field is 10500 m² and the perpendicular distance between the two parallel sides is 100 m, find the length of the side along the river.

There is a pentagonal shaped park as shown in the figure. For finding its area Jyoti and Kavita divided it in two different ways.

Express the given numbers in standard form.

0.0000000000085

Express the given numbers in standard form.

0.00000000000942

Express the given numbers in standard form.

6020000000000000

Express the given numbers in standard form.

0.00000000837

Express the given numbers in standard form.

31860000000

Express the given numbers in usual form.

3.02 × 10^-6

Express the given numbers in usual form.

4.5 × 10⁴

Express the given numbers in usual form.

3 × 10⁻⁸

Express the given numbers in usual form.

1.0001 × 10⁹

Express the given numbers in usual form.

5.8 × 10¹²

Express the given numbers in usual form.

3.61492 × 10⁶