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

Study the graph and answer the questions that follow.

1. What information does the graph give?
2. On which day was the temperature the least?
3. On which day was the temperature 31°C?
4. Which was the hottest day?

The following graph shows the change in temperature of a block of ice when heated. Use the graph to answer the following questions:

1. For how many seconds did the ice block have no change in temperature?
2. For how long was there a change in temperature?
3. After how many seconds of heating did the temperature become constant at 0°C?
4. What was the temperature after 25 seconds?
5. What will be the temperature after 1.5 minutes? Justify your answer.

The following graph shows the number of people present at a certain shop at different times. Observe the graph and answer the following questions.

1. What type of a graph is this?
2. What information does the graph give?
3. What is the busiest time of day at the shop?
4. How many people enter the shop when it opens?
5. About how many people are there in the shop at 1:30 pm?

As part of his science project, Prithvi was supposed to record the temperature every hour one Saturday from 6 am to midnight. At noon, he was taking lunch and forgot to record the temperature. At 8:00 pm, his favourite show came on and so forgot again. He recorded the data so collected on a graph sheet as shown below.

1. Why does it make sense to connect the points in this situation?
2. Describe the overall trend, or pattern, in the way the temperature changes over the time period shown on the graph.
3. Estimate the temperature at noon and 8 pm.

Simplify 3x (4x −5) + 3 and find its values for x = `1/2.` 

The product of two rational numbers is always a ________.

Find ten rational numbers between `(-2)/5` and `1/2`

Find five rational numbers between `2/3 " and " 4/5`

Find five rational numbers between `(-3)/2 " and " 5/3`

Find five rational numbers between `1/4 " and " 1/2`

Find ten rational numbers between `3/5 " and " 3/4`

Amina thinks of a number and subtracts `5/2` from it. She multiplies the result by 8. The result now obtained is 3 times the same number she thought of. What is the number?

A positive number is 5 times another number. If 21 is added to both the numbers, then one of the new numbers becomes twice the other new number. What are the numbers?

Sum of the digits of a two digit number is 9. When we interchange the digits it is found that the resulting new number is greater than the original number by 27. What is the two-digit number?

One of the two digits of a two digit number is three times the other digit. If you interchange the digit of this two-digit number and add the resulting number to the original number, you get 88. What is the original number?

Shobo’s mother’s present age is six times Shobo’s present age. Shobo’s age five years from now will be one third of this mother’s present age. What are their present ages?

There is a narrow rectangular plot, reserved for a school, in Mahuli village. The length and breadth of the plot are in the ratio 11:4. At the rate Rs 100 per metre it will cost the village panchayat Rs 75, 000 to fence the plot. What are the dimensions of the plot?

Hasan buys two kinds of cloth materials for school uniforms, shirt material that costs him Rs 50 per metre and trouser material that costs him Rs 90 per metre. For every 2 meters of the trouser material he buys 3 metres of the shirt material. He sells the materials at 12% and 10% profit respectively. His total sale is Rs 36660. How much trouser material did he buy?

Half of a herd of deer are grazing in the field and three fourths of the remaining are playing nearby. The rest 9 are drinking water from the pond. Find the number of deer in the herd.

A grandfather is ten times older than his granddaughter. He is also 54 years older than her. Find their present ages