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

A bowler throws a cricket ball at a speed of 120 km/h. How long does this ball take to travel a distance of 20 metres to reach the batsman?

Here is a key board of a harmonium:

1. Find the ratio of white keys to black keys on the keyboard.
   
2. What is the ratio of black keys to all keys on the given keyboard.
3. This pattern of keys is repeated on larger keyboard. How many black keys would you expect to find on a keyboard with 14 such patterns.

Here is a keyboard of a harmonium: What is the ratio of black keys to all keys on the given keyboard.

Here is a keyboard of a harmonium: This pattern of keys is repeated on larger keyboard. How many black keys would you expect to find on a keyboard with 14 such patterns.

The following table shows the distance travelled by one of the new eco-friendly energy-efficient cars travelled on gas.

Which type of properties are indicated by the table? How much distance will be covered by the car in 8 litres of gas?

Kritika is following this recipe for bread. She realises her sister used most of sugar syrup for her breakfast. Kritika has only `1/6` cup of syrup, so she decides to make a small size of bread. How much of each ingredient shall she use?

Bread recipe

1 cup quick cooking oats

2 cups bread flour

`1/3` cup sugar syrup

1 tablespoon cooking oil

`1 1/3` cups water

3 tablespoons yeast

1 teaspoon salt.

Many schools have a recommended students-teacher ratio as 35:1. Next year, school expects an increase in enrolment by 280 students. How many new teachers will they have to appoint to maintain the students-teacher ratio?

Kusum always forgets how to convert miles to kilometres and back again. However she remembers that her car’s speedometer shows both miles and kilometres. She knows that travelling 50 miles per hour is same as travelling 80 kilometres per hour. To cover a distance of 200 km, how many miles Kusum would have to go?

The students of Anju’s class sold posters to raise money. Anju wanted to create a ratio for finding the amount of money her class would make for different numbers of posters sold. She knew they could raise Rs 250 for every 60 posters sold.

1. How much money would Anju’s class make for selling 102 posters?
2. Could Anju’s class raise exactly Rs 2,000? If so, how many posters would they need to sell? If not, why?

The students of Anju’s class sold posters to raise money. Anju wanted to create a ratio for finding the amount of money her class would make for different numbers of posters sold. Could Anju’s class raise exactly Rs 2,000? If so, how many posters would they need to sell? If not, why?

The area of a parallelogram is 60 cm² and one of its altitudes is 5 cm. The length of its corresponding side is ______.

The perimeter of a rectangle becomes ______ times its original perimeter, if its length and breadth are doubled.

Mukesh walks around a circular track of radius 14 m with a speed of 4 km/hr. If he takes 20 rounds of the track, for how long does he walk?

Find the perimeter of the given figure.

Find the area of the shaded portion in the following figure.

Find the area of the shaded portion in the following figure.

Find the area of the shaded portion in the following figure.

Find the area of the shaded portion in the following figure.

Find the area of the shaded portion in the following figure.

Find the area of the shaded portion in the following figure.