NCERT Exemplar Solutions - Mathematics - class 7 solutions for Chapter 2 Fractions and Decimals

For the celebrating children‟s students of Class VII bought sweets for 740.25 and cold drink for Rs. 70. If 35 students contributed equally what amount, did each student contribute?

When 0.02964 is divided by 0.004, what will be the quotient ?

1/8 of a number equals $\frac{2}{5}\div\frac{1}{20}$ . What is the number?

Meteorology: One measure of average global temperature shows how each year varies from a base measure. The table shows results for several years.

Year	Difference from Base
1958	-0.9°C
1964	-0.17°C
1965	-0.10°C
1978	[[> widget id=”1″ <]]
2002	0.54°C

In 1946, the average temperature varied by -0.03°C from the base measure. Between which two years should 1946 fall when the years are ordered from coldest to warmest?

Meteorology: One measure of average global temperature shows how each year varies from a base measure. The table shows results for several years.

Year	Difference from Base
1958	-0.9°C
1964	-0.17°C
1965	-0.10°C
1978	[[> widget id=”1″ <]]
2002	0.54°C

Order the five years from coldest to warmest

In her science class, Jyoti learned that the atomic weight of Helium is 4.0030; of Hydrogen is 1.0080; and of Oxygen is 16.0000. Find the difference between the atomic weights of Helium and Hydrogen.

In her science class, Jyoti learned that the atomic weight of Helium is 4.0030; of Hydrogen is 1.0080; and of Oxygen is 16.0000. Find the difference between the atomic weights of Oxygen and Helium.

In her science class, Jyoti learned that the atomic weight of Helium is 4.0030; of Hydrogen is 1.0080; and of Oxygen is 16.0000. Find the difference between the atomic weights of Oxygen and Hydrogen.

It takes $2\frac{1}{2}$ m of cloth to make a shirt. How many shirts can Radhika make from a piece of cloth $9\frac{1}{3}$ m long?

Measurement made in science lab must be as accurate as possible. Ravi measured the length of an iron rod and said it was 19.34 cm long; Kamal said 19.25 cm; and Tabish said 19.27 cm. The correct length was 19.33 cm. How much of error was made by each of the boys?

What number divided by 520 gives the same quotient as 85 divided by 0.625?

A floor is 4.5 m long and 3.6 m wide. A 6 cm square tile costs 23.25. What will be the cost to cover the floor with these tiles?

It takes 17 full specific type of trees to make one tonne of paper. If there are 221 such trees in a forest, then what fraction of forest will be used to make 5 tonnes of paper ?

Sunita and Rehana want to make dresses for their dolls. Sunita has 3/4 m of cloth, and she gave 1/3 of it to Rehana. How much did Rehana have?

How much cloth will be used in making 6 shirts, if each required $2\frac{1}{4}$ m of cloth, allowing 1/8 m for waste in cutting and finishing in each shirt?

A picture hall has seats for 820 persons. At a recent film show, one usher guessed it was 3/4 full, another that it was 2/3 full. The ticket office reported 648 sales. Which usher (first or second) made the better guess?

The time taken by Rohan in five different races to run a distance of 500 m was 3.20 minutes, 3.37 minutes, 3.29 minutes, 3.17 minutes and 3.32 minutes. Find the average time taken by him in the races?

In a survey, 200 students were asked what influenced them most to buy their latest CD. The results are shown in the circle graph.

How many students said radio influenced those

most?

The weight of an object on moon is 1/6 its weight on Earth.If an object weighs $5\frac{3}{5}$ kg on Earth, how much would it weigh on the moon?

In the morning, a milkman filled $5\frac{1}{5}$ L of milk inhis can. He sold to Renu, Kamla and Renuka 3/4 L each; to Shadma he sold 7/8 L ; and to Jassi he gave $1\frac{1}{2}$ L. How much milk is left in the can?

In a survey, 200 students were asked what influenced them most to buy their latest CD. The results are shown in the circle graph.

How many said a friend or relative influenced them or they heard the CD in a shop?

In a survey, 200 students were asked what influenced them most to buy their latest CD. The results are shown in the circle graph.

How many more students were influenced by radio than by a music video channel?

Ravi can walk $3\frac{1}{3}$ km in one hour. How long will it take him to walk to his office, which is 10 km from his home?

Raj travels 360 km on three fifths of his petrol tank. How far would he travel at the same rate with a full tank of petrol?

Anuradha can do a piece of work in 6 hours. What part of the work can she do in 1 hour?

What portion of a ‘saree’can Rehana paint in 1 hour if it requires 5 hours to paint the whole saree? In $3\frac{1}{2}$ hours?

Rama has $6\frac{1}{4}$ kg of cotton wool for making pillows. If one pillow takes $1\frac{1}{4}$ kg, how many pillows can she make?

Kajol has ₹ 75. This is 3/8 of the amount she earned. How much did she earn?

A public sewer line is being installed along $80\frac{1}{4}$ m of road. The supervisor says that the labourers will be able to complete 7.5 m in one day. How long will the project take to complete?

It takes 17 full specific type of trees to make one tonne of paper. If there are 221 such trees in a forest, then what takes to save 7/13 part of the forest how much of paper we have to save.

It takes 17 full specific type of trees to make one tonne of paper. If there are 221 such trees in a forest, then what fraction of forest will be used to make 10 tonnes of paper ?

What portion of a ‘saree’can Rehana paint in 1 hour if it requires 5 hours to paint the whole saree? In $4\frac{3}{5}$ hours?

Simplify and write the result in decimal form $\left(1\div\frac{2}{9}\right)+\left(1\div3\frac{1}{5}\right)+\left(1\div2\frac{2}{3}\right)$

Some pictures (a) to (f) are given below. Tell which of them show:

$\frac{1}{4}\times4$

Some pictures (a) to (f) are given below. Tell which of them show:

$\frac{1}{4}\times3$

A square and an equilateral triangle have a side in common. If side of triangle is 4/3 cm long, find the perimeter of figure formed (see figure).

Some pictures (a) to (f) are given below. Tell which of them show:

$2\times\frac{1}{4}$

Evaluate : (0.3) × (0.3) – (0.2) (0.2)

Evaluate: $\frac{0.6}{0.3}+\frac{0.16}{0.4}$

Find the value of : $\frac{(0.2\times0.14)+(0.5+0.91)}{(0.1\times0.2)}$

Some pictures (a) to (f) are given below. Tell which of them show:

$3\times\frac{2}{9}$

Rita has bought a carpet of size $4m\times6\frac{2}{3}m$ . But her room size is $3\frac{1}{3}m\times5\frac{1}{3}m$ . What fraction of area should be cut off to fit wall-to-wall carpet into the room?

Sports: Reaction time measures how Questionuickly a runner reacts to the starter pistol. In the 100 m dash at the 2004 Olympic Games, Lauryn Williams had a reaction time of 0.214 second. Her total race time, including reaction time, was 11.03 seconds. How long did it take her to run the actual distance?

Cost of a burger is ₹ $20\frac{3}{4}$ and of Macpuff is ₹ $15\frac{1}{2}$ . Find the cost of 4 burgers and 14 Macpuffs.

Family photograph has length $14\frac{2}{5}$ cm and breadth $10\frac{2}{5}$ cm. It has border of uniform width $2\frac{3}{5}$ cm. Find the area of framed photograph.

A hill, $101\frac{1}{3}$ m in height, has 1/4th of its height under water. What is the height of the hill visible above the water?

State wether $\frac{2}{3}\div\frac{2}{1}$ is greater than 1 or less than 1.

Replace the ‘?’ with an appropriate fraction.

A student compared −(1/4) and -0.3 . He changed −(1/4) to the decimal -0.25 and wrote, “Since 0.3 is greater than 0.25,-0.3 is greater than -0.25”. Is there any error in the statment.

In the pattern, $\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\ldots$ which fraction makes the sum greater than 1 (first time)?

A student multiplied two mixed fractions in the following manner: $2\frac{4}{7}\times3\frac{1}{4}=6\frac{1}{7}$

Is there any error in the statement?

There are four containers that are arranged in the ascending order of their heights. If the height of the smallest container given in the figure is expressed as $\frac{7}{25}x=10.5\mathrm{~cm}$ . Find the height of the largest container.

Convet $0.82$ into fractional form.

State wether $\frac{1}{5}\div\frac{1}{2}$ is greater than 1 or less than 1.

Some pictures (a) to (f) are given below. Tell which of them show:

$2\times\frac{1}{3}$

Replace the ‘?’ with an appropriate fraction.

Some pictures (a) to (f) are given below. Tell which of them show:

$2\times\frac{3}{7}$

The product of two proper fractions is _______ than each of the fractions that are multiplied.

State wether $\frac{2}{3}\div\frac{1}{2}$ is greater than 1 or less than 1.

Pictorial representation of 3 × 2/3 is:

Renu completed 2/3 part of her home work in 2 hours. How much part of her home work had she completed in 1¼ hours?

$\frac{2}{5}\times5\frac{1}{5}$ is equal to

3¾ ÷ ¾ is equal to:

A ribbon of length 5¼ m is cut into small pieces each of length ¾m. Number of pieces will be:

The ascending arrangement of (2/3), (6/7), (13/21) is:

The product of 11/13 and 4 is:

The product of 3 and $4\frac{2}{5}$ is

$\frac{1}{5}\div\frac{4}{5}\ =\ ?$

The product of 0.03 × 0.9 is

(5/7) ÷ 6 is equal to

$5\frac{1}{6}\div\frac{9}{2}$ is equal to

Which of the following represents 1/3 of 1/6 ?

3/7 of 2/5 is equal to

One packet of biscuits requires 2½ cups of flour and $1\frac{2}{3}$ cups of sugar. Estimated total quantity of both ingredients used in 10 such packets of biscuits will be

The product of 7 and 6¾ is

On dividing 7 by 2/5, the result is

$2\frac{2}{3}\div5$ is equal to

The picture

Interprets

Rani ate 2/7 part of a cake while her brother Ravi ate 4/5 of the remaining. Part of the cake left is ______ .

2/3 of 27 is

4/5 of 45 is ______ .

$4\times6\frac{1}{3}$ is equal to ______ .

4/5 of 5 kg apples were used on Monday. The next day 1/3 of what was left was used. Weight (in kg) of apples left now is

$\frac{1}{2}\text{ of }4\frac{2}{7}$ is _____

1/9 of 6/5 is

The lowest form of the product $2\frac{3}{7}\times\frac{7}{9}$ is

(4/5) ÷ 4 is equal to

2/5 of 25 is

4.7 ÷ 1000 = ______

25.4 × 1000 = _______

93.5 × 100 = _______

3.2 × 10 = _______

(1/5) ÷ (5/6) = (1/5) ____ (6/5)

8.4 ÷ ______ = 2.1

4.7 ÷ 10 = ______

4.7 ÷ 100 = _____

52.7 ÷ _______ = 0.527

0.5 _____ 0.7 = 0.35

While dividing a fraction by another fraction, we _________ the first fraction by the _______ of the other

2 ____ (5/3) = 10/3

2.001 ÷ 0.003 = __________

Product of two fractions = (Product of their denominators)/ (Product of their numerators)

The product of two improper fractions is less than both the fractions.

To multiply a decimal number by 1000, we move the decimal point in the number to the right by three places.

To divide a decimal number by 100, we move the decimal point in the number to the left by two places.

2/3 of 8 is same as (2/3) ÷ 8

What happens to the value of a fraction if the denominator of the fraction is decreased while numerator is kept unchanged?

Which letter comes 2/5 of the way among A and J?

If 2/3 of a number is 10, then what is 1.75 times of that number?

In a class of 40 students, 1/5 of the total number of students like to eat rice only, 2/5 of the total number of students like to eat chapati only and the remaining students like to eat both. What fraction of the total number of students like to eat both?

Reemu read (1/5)^th pages of a book. If she reads further 40 pages, she would have read (7/10)^th pages of the book. How many pages are left to be read?

Animals: The label on a bottle of pet vitamins

lists dosage guidelines. What dosage would you give an 18 kg adult dog?

(1/2 tablespoon per 9 kg body weight)

In a hurdle race, Nidhi is over hurdle B and 2/6 of the way through the race, as shown in the given figure. Where will Nidhi be when she is 5/6 of the way through the race?

In a hurdle race, Nidhi is over hurdle B and 2/6 of the way through the race, as shown in the given figure. Give two fractions to tell what part of the race Nidhi has finished when she is over hurdle C.

Will the quotient $7\frac{1}{6}\div3\frac{2}{3}$ be a fraction greater than 1.5 or less than 1.5? Explain.

Health: The directions for a pain reliever recommend that an adult of 60 kg and over take 4 tablets every 4 hours as needed, and an adult who weighs between 40 and 50 kg take only $2\frac{1}{2}$ tablets every 4 hours as needed. Each tablet weighs $\frac{4}{25}$ grams. If a 72 kg adult takes 4 tablets, how many grams of pain reliever is he or she receivings?

Animals: The label on a bottle of pet vitamins

lists dosage guidelines. What dosage would you give an 18 kg pregnant dog?

(For puppies, pregnant dogs, or nursing dogs – 1/2 tablespoon per 4.5 kg body weight).

Animals: The label on a bottle of pet vitamins

lists dosage guidelines. What dosage would you give a 6 kg cat?

(1/4 tablespoon per kg body weight)

Health: The directions for a pain reliever recommend that an adult of 60 kg and over take 4 tablets every 4 hours as needed, and an adult who weighs between 40 and 50 kg take only $2\frac{1}{2}$ tablets every 4 hours as needed. Each tablet weighs $\frac{4}{25}$ grams. How many grams of pain reliever is the recommended dose for an adult weighing 46 kg?

How many 1/16 kg boxes of chocolates can be made with $1\frac{1}{2}$ kg chocolates ?

The largest square that can be drawn in a circle has a side whose length is 0.707 times the diameter of the circle. By this rule, find the length of the side of such a square when the diameter of the circle is 14.35 cm.

To find the distance around a circular disc, multiply the diameter of the disc by 3.14. What is the distance around the disc when the radius is 6.45 cm?

To find the distance around a circular disc, multiply the diameter of the disc by 3.14. What is the distance around the disc when the diameter is 18.7 cm?

What is the cost of 27.5 m of cloth at ₹ 53.50 per metre?

In a hurdle race, Nidhi is over hurdle B and 2/6 of the way through the race, as shown in the given figure. Where will Nidhi be, when she is 4/6 of the way through the race?

A rule for finding the approximate length of diagonal of a square is to multiply the length of a side of the square by 1.414. Find the length of the diagonal when the length of a side of the square is exactly 7.875 cm.

A rule for finding the approximate length of diagonal of a square is to multiply the length of a side of the square by 1.414. Find the length of the diagonal when the length of a side of the square is 8.3 cm.

The largest square that can be drawn in a circle has a side whose length is 0.707 times the diameter of the circle. By this rule, find the length of the side of such a square when the diameter of the circle is 8.63 cm.

Diameter of Earth is 12756000 m. In 1996, a new planet was discovered whose diameter is 5/86 of the diameter of Earth. Find the diameter of this planet in km.

Write the number in the box ☐ such that $\frac{3}{7}\times☐=\frac{15}{98}$

Anvi is making bookmarker like the one shown in the given figure. How many bookmarker can she make from a 15 m long ribbon?

The normal body temperature is 98.6°F. When Savitri was ill her temperature rose to 103.1°F. How many degrees above normal was that?

Simplify $\frac{\frac{1}{4}+\frac{1}{5}}{1-\frac{3}{8} \times \frac{3}{5}}$

Divide 3/10 by ( 1/4 of 3/5 )

Simplify $\frac{2\frac{1}{2}+\frac{1}{5}}{2\frac{1}{2}\div\frac{1}{5}}$

A flower garden is 22.50 m long. Sheela wants to make a border along one side using bricks that are 0.25 m long. How many bricks will be needed?

Heena’s father paid an electric bill of ₹ 95.70 out of a 500 rupee note. How much change should he have received?

(2/5) × 5(1)/(5) is equal to:

(a) 26/25 (b) 52/25 (c) 2/5 (d) 6

3¾ ÷ ¾ is equal to:

(a) 3 (b) 4 c) 5 (d) 45/16

The ascending arrangement of (2/3), (6/7), (13/21) is:

(a) 6/7, 2/3, 13/21 (b) 13/21, 2/3, 6/7

(c) 6/7, 13/21, 2/3 (d) 2/3, 6/7, 13/21

Reciprocal of the fraction 2/3 is:

(a) 2 (b) 3 (c) 2/3 (d) 3/2

The product of 11/13 and 4 is:

The Product of 3 and 4 (2)/(5) is :

(a) 17 (1)/(5) (b) 24/5 (c) 13 (1)/(5) (d) 13 (5)/(3)

The pictorial representation of 3 × 2/3 is:

1/5 ÷ 4/5 equal to:

(a) 4/5 (b) 1/5 (c) 5/4 (d) ¼

The product of 0.03 × 0.9 is:

(a) 2.7 (b) 0.27 (c) 0.027 (d) 0.0027

(5/7) ÷ 6 is equal to:

(a) 30/7 (b) 5/42 (c) 30/42 (d) 6/7

5 (1)/(6) ÷ 9/2 is equal to:

(a) 31/6 (b) 1/27 (c) 5 (1)/(27) (d) 31/27

Which of the following represents 1/3 of 1/6?

(a) (1/3) + (1/6) (b) (1/3) – (1/6)

(c) (1/3) × (1/6) (d) (1/3) ÷ (1/6)

3/7 of 2/5 is equal to

(a) 5/12 (b) 5/35 (c) 1/35 (d) 6/35

One packet of biscuits requires 2½ cups of flour and 1 (2)/(3) cups of sugar. Estimated the total quantity of both ingredients used in 10 such packets of biscuits will be

(a) less than 30 cups

(b) between 30 cups and 40 cups

(c) between 40 cups and 50 cups

(d) above 50 cups

The product of 7 and 6¾ is

(a) 42¼ (b) 47¼ (c) 42¾ (d) 47¾

On dividing 7 by 2/5, the result is

(a) 14/2 (b) 35/4 (c) 14/5 (d) 35/2

2(2)/(3)÷ 5 is equal to

(a) 8/15 (b) 40/3 (c) 40/5 (d) 8/3

4/5 of 5 kg apples were used on Monday. The next day 1/3 of what was left was used. Weight (in kg) of apples left now is

(a) 2/7 (b) 1/14 (c) 2/3 (d) 4/21

The picture

Interprets

(a) ¼ ÷ 3 (b) 3 × ¼ (c) ¾ × 3 (d) 3 ÷ ¼

Rani ate 2/7 part of a cake while her brother Ravi ate 4/5 of the remaining. Part of the cake left is ________

The reciprocal of 3/7 is ____________

2/3 of 27 is __________

4/5 of 45 is __________

4 × 6(1)/(3) is equal to ___________

½ of 4(2)/(7) is ________________