Secondary School (English Medium) (5 to 8) Class 8 - CBSE Question Bank Solutions for Mathematics

In Fig. 20.38, a parallelogram is drawn in a trapezium, the area of the parallelogram is 80 cm², find the area of the trapezium.

Find the area of the field shown in Fig. 20.39 by dividing it into a square, a rectangle and a trapezium.

Find the area of the pentagon shown in fig. 20.48, if AD = 10 cm, AG = 8 cm, AH = 6 cm, AF = 5 cm, BF = 5 cm, CG = 7 cm and EH = 3 cm.

Find the area enclosed by each of the following figures [Fig. 20.49 (i)-(iii)] as the sum of the areas of a rectangle and a trapezium:

There is a pentagonal shaped park as shown in Fig. 20.50. Jyoti and Kavita divided it in two different ways.

Find the area of this park using both ways. Can you suggest some another way of finding its areas?

Find the value of (3⁰ + 4⁻¹) × 2².

Find the value of  (2⁻¹ × 4⁻¹) ÷2⁻².

Find the value of `(1/2)^(-2)+(1/3)^(-2)+(1/4)^(-2)`

Evaluate.

`(8^(-1)xx5^(3))/2^(-4)`

Evaluate.

(5⁻¹ × 2⁻¹))× 6⁻¹

6 pipes are required to fill a tank in 1 hour 20 minutes. How long will it take if only 5 pipes of the same type are used?

The following data gives total marks (out of 600) obtained by six children of a particular class. Represent the data on a bar graph.

Find the multiplicative inverse of the following.
2^{– 4}

Find the multiplicative inverse of the following.

Find the multiplicative inverse of the following.
10^{– 5}

Expand the following numbers using exponents.

1025.63

Expand the following numbers using exponents.

1256.249