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151.

Find the difference of:(i) (13/24) and (7/16)(ii) 6 and (23/3)

Answer»

(i) Given (13/24) and (7/16)

To find the difference we have to make it equivalent fractions.

Taking LCM of 24 and 16 is 48.

Now converting the given fractions into equivalent fractions with denominator 48.

(13/24) – (7/16) = (26/48) – (21/48)

= (26 – 21)/48

= (5/48)

(ii) Given 6 and (23/3)

To find the difference we have to make it equivalent fractions.

Taking LCM of 3 and 1 is 3.

Now converting the given fractions into equivalent fractions with denominator 3.

(23/3) – 6 = (23/3) – (18/3)

= (23 – 18)/3

= (5/3)

152.

Find the difference of:(i) (21/25) and (18/20)(ii) 3 (3/10) and 2 (7/15)

Answer»

(i) Given (21/25) and (18/20)

To find the difference we have to make it equivalent fractions.

Taking LCM of 25 and 20 is 100.

Now converting the given fractions into equivalent fractions with denominator 100.

(18/20) – (21/25) 

= (90/100) – (84/100)

= (90 – 84)/100

= 6/100

By converting it into its simplest form we get

= 3/50

(ii) Given 3 (3/10) and 2 (7/15)

First convert given mixed fractions into improper fractions.

(33/10) and (37/15)

To find the difference we have to make it equivalent fractions.

Taking LCM of 10 and 15 is 30.

Now converting the given fractions into equivalent fractions with denominator 30.

(33/10) – (37/15) 

= (99/30) – (74/30)

= (99 – 74)/30

= (25/30)

By converting it into simplest form we get

= (5/6)

153.

Apples are sold at ₹ [48(4/5)] per kg. What is the cost of [3(3/4)] kg of apples?

Answer»

From the question,

The cost of 1 kg of apples = [48(4/5)] = (244/5)

Therefore, the cost of [3(3/4)] kg of apples = (15/4)

Then,

= (244/5) × (15/4)

= (244 × 15) / (5 × 4)

On simplifying we get,

= (61 × 3) / (1 × 1)

= ₹ 183

Hence, the cost of [3(3/4)] kg is ₹ 183

154.

Find the difference:(i) (6/7) – (9/11)(ii) 8 – (5/9)

Answer»

(i) Given (6/7) – (9/11)

To find the difference we have to make it equivalent fractions.

Taking LCM of 7 and 11 is 77.

Now converting the given fractions into equivalent fractions with denominator 77.

Equivalent fractions are (66/77) and (63/77)

(6/7) – (9/11) 

= (66/77) – (63/77)

= (66 – 63)/77

= (3/77)

(ii) Given 8 – (5/9)

To find the difference we have to make it equivalent fractions.

Taking LCM of 1 and 9 is 9.

Now converting the given fractions into equivalent fractions with denominator 9.

Equivalent fractions are (72/9) and (5/9)

8 – (5/9) 

= (72/9) – (5/9)

= (72 -5)/9

= (67/9)

155.

The cost of 6 (1/4) kg of apples is Rs 400. At what rate per kg are the apples being sold?

Answer»

The cost of 6 (1/4) kg = (25/4) of apples is Rs 400

Cost of apple per kg is = (25/4) /400

= (4/25) × 400

= Rs 64

156.

Find the difference:(i) 9 – 5 (2/3)(ii) 4 (3/10) – 1 (2/15)

Answer»

(i) Given 9 – 5 (2/3)

First convert the given mixed fraction into improper fraction.

We get 5 (2/3) = (17/3)

To find the difference we have to make it equivalent fractions.

Taking LCM of 1 and 3 is 3.

Now converting the given fractions into equivalent fractions with denominator 3.

Equivalent fractions are (27/3) and (17/3)

9 – 5 (2/3) = (27/3) – (17/3)

= (10/3)

(ii) Given 4 (3/10) – 1 (2/15)

First convert the given mixed fraction into improper fraction.

We get (43/10) and (17/15)

To find the difference we have to make it equivalent fractions.

Taking LCM of 10 and 15 is 30.

Now converting the given fractions into equivalent fractions with denominator 30.

Equivalent fractions are (129/30) and (34/30)

4 (3/10) – 1 (2/15) 

= (43/10) – (17/15)

= (129/30) – (34/30)

= (129 – 34)/30

= (95/30)

= (19/6)

157.

The product of two numbers is 25 (5/6). If one of the numbers is 6 (2/3), find the other.

Answer»

Given product of two numbers is 25 (5/6) = (155/6)

One of the number is 6 (2/3) = (20/3)

Let the other number be x

(155/6) = x × (20/3)

x = (3/20) × (155/6)

x = (31/8)

x = 3 (7/8)

158.

Simplify:(i) (2/3) + (1/6) – (2/9)(ii) 12 – 3 (1/2)(iii) 7 (5/6) – 4 (3/8) + 2 (7/12)

Answer»

(i) Given (2/3) + (1/6) – (2/9)

Taking the LCM of 3, 6 and 9 is 18

Now we have to convert the given fraction into equivalent fraction with denominator 18

(2/3) + (1/6) – (2/9) 

= (12/18) + (3/18) – (4/18)

= (12 + 3 – 4)/18

= 11/18

(ii) Given 12 – 3 (1/2)

First convert the given mixed fraction into improper fraction we get (7/2)

Taking the LCM of 2 and 1 is 2

Now we have to convert the given fraction into equivalent fraction with denominator 2

12 – 3 (1/2) 

= (24/2) – (7/2)

= (24 -7)/2

= (17/2)

(iii) Given 7 (5/6) – 4 (3/8) + 2 (7/12)

First convert the given mixed fraction into improper fraction we get (47/6), (35/8) and (31/12)

Taking the LCM of 12, 6 and 8 is 48

Now we have to convert the given fraction into equivalent fraction with denominator 48

7 (5/6) – 4 (3/8) + 2 (7/12) 

= (47/6) – (35/8) + (31/12)

= (376/48) – (210/48) + (124/48)

= (376 – 210 + 124)/48

= (290/48)

= (145/24)

159.

What should be added to 5 (3/7) to get 12?

Answer»

Given 5 (3/7)

First convert the given mixed fraction into improper fraction we get (38/7)

Let x be the number added to (38/7) to get 12

Therefore x + (38/7) = 12

x = 12 – (38/7)

By taking LCM for 7 and 1 is 7

x = (12 × 7 – 38)/7

x = (84 – 38)/7

x = (46/7)

Hence (46/7) is the number which is added to 5 (3/7) to get 12.

160.

What should be added to 5 (4/15) to get 12 (3/5)?

Answer»

Given 5 (4/15)

First convert the given mixed fraction into improper fraction we get (79/15)

Let x be the number added to (79/15) to get (63/5)

Therefore x + (79/15) = (63/5)

x = (63/5) – (79/15)

By taking LCM for 15 and 5 is 15

x = (63 × 3 – 79)/15

x = (189 – 79)/15

x = (110/15) 

= (22/3)

Hence (22/3) is the number which is added to 5 (4/15) to get 12 (3/5).

161.

By what number should 6 (2/9) be multiplied to get 4 (4/9)?

Answer»

Let x be the number which needs to be multiplied by 6 (2/9) = (56/9)

x × (56/9) = 4 (4/9)

x × (56/9) = (40/9)

x = (40/9) × (9/56)

x = (40/56)

x = (5/7)

162.

The value of 23. 875 – 0.235 = …………… A) 23.640 B) 21.640 C) 0.375 D) 25.105

Answer»

(A) 23.640

23.875 - 0.235 = 23.640

Correct option is  A) 23.640

163.

2\(\frac{1}{3}\) ÷ 3\(\frac{4}{7}\) = ………………?A) \(\frac{3}{25}\)B) \(\frac{25}{3}\)C) \(\frac{75}{49}\)D) \(\frac{49}{75}\)

Answer»

Correct option is (D) 49/75

2\(\frac13\) \(\div\) 3\(\frac47\) = \(\frac{2\times3+1}{3}\div\frac{3\times7+4}7\) 

\(\frac73\div\frac{25}7\) = \(\frac73\times\frac7{25}\) = \(\frac{49}{75}\)

Correct option is   D) \(\frac{49}{75}\)

164.

Lowest form of 2/7 × 3\(\frac{1}{2}\) × 1\(\frac{1}{5}\) × 2\(\frac{1}{2}\)= …………………?A) 3 B) 1/2 C) 4 D) 1/3 

Answer»

2/7 x \(\frac{3\times2+1}2\times\frac{1\times5+1}5\times\frac{2\times2+1}2\) 

\(=(\frac27\times\frac72)\times(\frac65\times\frac52)\) 

 = 1 x 3

 = 3

Correct option is  A) 3

165.

1/ 4 x ? = 3/20 A) 3/5B) 4/5 C) 3 D) 1/5

Answer»

Correct option is  A) 3/5

166.

The total number of pages in a book are 7 . If Gayatri read 5 pages, then number of pages are to be read? A) 3 B) 2 C) 2\(\frac{1}{8}\)D) 3\(\frac{1}{8}\)

Answer»

Correct option is  B) 2

167.

2/5 of 15 - 1/3 of 12 = ................? A) 10 B) 0 C) 2 D) 1

Answer»

Correct option is (C) 2

2/5 x 15 - 1/2 x 12

 = 2 x 3 - 4

 = 6 - 4

 = 2

Correct option is  C) 2

168.

\(5\frac{7}{6}\) x \(1\frac{2}{37}\) = ...................?A) \(\frac{39}{37}\)B) \(\frac{37}{39}\)C) \(\frac{2}{13}\)D) \(\frac{13}{2}\)

Answer»

Correct option is (D) 13/2
\(=\frac{5\times6+7}6\times\frac{1\times37+2}{37}\) 

 = \(\frac{37}{6}\times\frac{35}{37} = \frac{39}6=\frac{13}2\)

Correct option is  D) \(\frac{13}{2}\)

169.

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?

Answer»

Total time taken by Rohan in five races

= (3.20 +3.37 +3.29 +3.17 +3.32] minutes

= 16.35 minutes

Total number of races = 5

∴ The average time taken by Rohan

= 16.35/5  minutes = 3.27 minutes

170.

Value of 7.9 ÷ 1000 will be :(A) 3.0079(B) 0.079(C) 0.79(D) 7.9

Answer»

The Value of 7.9 ÷ 1000 will be 3.0079.

171.

If all the three cakes are divided among the total participants of the function what would be each one’s share? Discuss.

Answer»

Total participants of the function = 9

Total number of cakes = 3

∴ Each cake should be divided into 3 equal parts.

∴ Total number of equal parts of cake = 9

∴ Each one’s share may be 1/9 of total cakes or 1/3 of a cake.

172.

How many 1/2 cm log pieces can be cut of 11 1/2 long ribon?

Answer»

Length of ribon = 111/2 cm = 23/2 cm

∴ Number of pieces to be cut = 23/2 ÷ 1/2

=23/2 x 2/1 = 23 pieces

173.

Mohan leaves Rs. 1,20,000 to his wife and three children such that two-fifths of this money is given to his wife and the remaining is distributed equally among the children. Find, how much each child gets ?

Answer»

Total amount = Rs. 12,0,000

Amount given to his wife = 2/5 of Rs. 1,20,000

= Rs. 2 x 24,000 = Rs. 48,000

Remaining amount = Rs. 120000 – Rs. 48000 = Rs. 72000

This amount is distributed among three children equally.

Each’s share = Rs. 72,000 x 1/3 = Rs. 24,000

174.

The two consecutive integers between which the fraction 5/7 lies are(A) 5 and 6 (B) 0 and 1 (C) 5 and 7 (D) 6 and 7

Answer»

(B) 0 and 1

A fraction whose numerator is less than the denominator is called a proper fraction.

So, 5/7 = 0.715

Therefore, 5/7 lies between 0 and 1.

175.

Ravish reads (1/3) part of a book in 1 hour. How much part of the book will he read in 2 (1/5) hours?

Answer»

Given Ravish takes 1 hour to read (1/3) part of the book

Then we have to calculate how much part he will read in 2 (1/5) hours

First convert the given mixed fraction into improper fractions is (11/5)

Now let x be the full part of book

1 hour = (1/3) x

Remaining part of the book, he will read in

= (11/5) × (1/3) x

= (11/5) part of the book

176.

Shikha plants 5 saplings in a row in her garden. The distance between two adjacent saplings is ¾ m. Find the distance between the first and the last sapling.

Answer»

Given that the distance between two adjacent saplings is (3/4) m

There are 4 adjacent spacing for 5 sapling

Therefore, distance between the first and the last sapling is

= (3/4) × 4

= 3

The distance between them is 3m

177.

Write the fractions and pair up the equivalent fractions from each row.

Answer»

(a) Here, 1 parts is shaded out of 2 equal parts ( i,e., rectangle) Hence this, Figure represents a fraction 1/2

(b) Here, 4 parts is shaded out of 6 equal parts ( i,e., rectangle) Hence this, Figure represents a fraction 4/6 = 2/3

(c) Here, 3 parts is shaded out of 9 equal parts ( i,e., rectangle) Hence this, Figure represents a fraction 3/9 = 1/3

(d) Here, 2 parts is shaded out of 8 equal parts ( i,e., rectangle) Hence this, Figure represents a fraction 2/8 = 1/4

(e) Here,3 parts is shaded out of 4 equal parts ( i,e., rectangle) Hence this, Figure represents a fraction 3/4

(i) Here,6 parts are shaded out of 18 equal parts (i.e, triangles) Hence, this figure represents a fraction 6/18 = 1/3

(ii) Here, 4 parts are shaded out of 8 equal parts (i,e, rectangle) Hence, this figure represents a fraction 4/8 = 1/2

(iii) Here, 12 parts are shaded out o f 16 equal parts (i.e , squares) Hence, this figure 12/16 = 3/6

(iv) Here, 8 parts are shaded out of 12 equal parts (i,e . rectangle) Hence, this figure represents a fraction 8/12 = 2/3

(v) Here,4 parts are shaded out of 16 equal parts (i,e , triangles) Hence, this figure represents a fraction 4/16 = 1/4

Now these figures can be, matched correctly as (a)(ii), (b)(iv), (c)(i), (d)(v), (e)(iii).

178.

Write the following examples using fraction: i. If 9 kg rice is shared among 5 people, how many kilograms of rice does each person get? ii. To make 5 shirts of the same size, 11 meters of cloth is needed. How much cloth is needed for one shirt?

Answer»

i. Total quantity of rice = 9 kg 

Number of people = 5 

∴ Kilograms of rice received by each person = \(\cfrac{9}{5}\)

∴ Each person will get \(\cfrac{9}{5}\) kg of rice.

ii. Total meters of cloth = 11 meters 

Number of shirts to be made = 5

Meters of cloth needed to make 1 shirt = \(\cfrac{11}{5}\)
∴ Cloth needed to make 1 shirt is \(\cfrac{11}{5}\) meters.

179.

A fraction acts as an operator ________. a) ‘of ’ b) on c) or d) None of these

Answer»

Fraction as an operator ‘of ’

Fraction acts as an operator of 'of' represents multiplication.

Ex: 1/3 of 90 

= 1/3 × 90 

= 30.

180.

State whether the statement is true or false:The sum of two fractions is always a fraction.

Answer»

True.

For example: consider two fractions 10/5 and 15/5.

Sum of two fractions = (10 + 15)/5

= 25/5

= 5

= 5/1

A fraction in which there is no common factor, except 1, in its numerator and denominator is called a fraction in the simplest or lowest form.

When 2 fractions are added, the result in most cases will be a fraction p/q form, but in some case if it does happen to be just a integer, it can always be written with denominator 1 (hence p/q form).

181.

State whether the statement is true or false: The result obtained by subtracting a fraction from another fraction is necessarily a fraction.

Answer»

False.

Not necessarily a fraction. But can be written in fraction.

182.

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?

Answer»

The normal body temperature = 98.6°F

Savitri’s temperature, when she was ill = 103.1°F

∴ Savitri’s temperature above normal

= 103.1°F – 98.6°F

= 4.5°F

183.

Dipika buys a box of tomatoes at the wholesale rate of ₹ 16.50 per kg from the vegetable market. If the tomatoes weigh 22.5 kg then how much money will Dipika pay to the wholeseller.

Answer»

∵ Price of 1 kg tomato = ₹16.50

∴ Price of 22.5 kg tomato = 6.50 x 22.5

= ₹371.25

184.

Write the fraction represented by the unshaded portion of the adjoining figure:

Answer»

In the given figure, total parts in which figure has been divided is 15 and out of which 4 parts are unshaded.

∴ The required fraction is 4/15.

185.

Subtract :i. 9/14 − 3/14ii. 5/6 − 3/6iii. 9/16 − 5/16iv. 7/8 − 3/8 − 1/8

Answer»

i. \(\frac{9}{14}-\frac{3}{14}=\frac{9-3}{14}=\frac{6}{14}\)

ii. \(\frac{5}{6}-\frac{3}{6}=\frac{5-3}{6}=\frac{2}{6}\)

iii. \(\frac{9}{16}-\frac{5}{16}=\frac{9-5}{16}=\frac{4}{16}\)

iv. \(\frac{7}{8}-\frac{3}{8}-\frac{1}{8}=\frac{7-3-1}{8}=\frac{3}{8}\)

186.

Subtract the following:i. 5/7 − 1/7ii. 5/8 − 3/8iii. 7/9 − 2/9iv. 8/11 − 5/11

Answer»

i. \(\frac{5}{7}-\frac{1}{7}=\frac{5-1}{7}=\frac{4}{7}\)

ii. \(\frac{5}{8}-\frac{3}{8}=\frac{5-3}{8}=\frac{2}{8}\)

iii. \(\frac{7}{9}-\frac{2}{9}=\frac{7-2}{9}=\frac{5}{9}\)

iv. \(\frac{8}{11}-\frac{5}{11}=\frac{8-5}{11}=\frac{3}{11}\)

187.

Subtract the following:i. 9/13 − 4/13ii. 7/10 − 3/10iii. 9/12 − 2/12iv. 10/15 − 3/15

Answer»

i. \(\frac{9}{13}-\frac{4}{13}=\frac{9-4}{13}=\frac{5}{13}\)

ii. \(\frac{7}{10}-\frac{3}{10}=\frac{7-3}{10}=\frac{4}{10}\)

iii. \(\frac{9}{12}-\frac{2}{12}=\frac{9-2}{12}=\frac{7}{12}\)

iv. \(\frac{10}{15}-\frac{3}{15}=\frac{10-3}{15}=\frac{7}{15}\)

188.

Add the following:i. 1/6 + 2/6ii. 1/4 + 3/4iii. 5/13 + 2/13 + 3/13iv. 2/9 + 3/7v. 3/11 + 2/3vi. 1/10 + 4/5

Answer»

i. \(\frac{3}{6}\)

ii. \(\frac{4}{4}\)

iii. \(\frac{10}{13}\)

iv. \(\frac{41}{63}\)

v. \(\frac{31}{33}\)

vi \(\frac{9}{10}\)

189.

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

Answer»

There are 10 letters from A to J

So, 2/5 of 10 = 2/5 × 10

= 2 × 2

= 4

The 4th letter from A to J is D.

Therefore, D comes 2/5 of the way among A and J.

190.

Subtract the following:i. 5/6 − 1/6ii. 3/5 − 2/5iii. 7/16 − 3/16 − 1/16iv. 5/6 − 7/12v. 13/16 − 5/8vi. 4/9 − 3/10

Answer»

i. \(\frac{4}{6}\)

ii. \(\frac{1}{5}\)

iii. \(\frac{3}{16}\)

iv. \(\frac{3}{12}\)

v. \(\frac{3}{13}\)

vi. \(\frac{13}{90}\)

191.

Devansh painted the 2/3 part of a wall of his room. His sister Janhvi helped him and painted 1/3 part of the same wall. Find out how much part of the room they painted altogether?

Answer»

Devansh painted the wall = (2/3) part 

Janhvi painted the wall = (1/3) part 

∴ They both painted altogether = ((2/3) + (1/3)) part 

= ((2 + 1)/3) part = (3/3) part = 1 part

192.

In a hurdle race, Nidhi is over hurdle B and 2/6 of the way through the race, as shown in the given figure.Then, answer the following:(a) Where will Nidhi be, when she is  of the way through the race?(b) Where will Nidhi be when she is  of the way through the race?(c) Give two fractions to tell what part of the race Nidhi has finished when she is over hurdle C.

Answer»

(a) When Nidhi is 4/6 of the way through the race, she will be at hurdle D.

(b) When Nidhi is 5/6 of the way through the race, she will be at hurdle E.

(c) When Nidhi is over hurdle C, she would finished the 3/6 or 1/2 or middle part of the race.

193.

Find the part of each of the following numbers equal to the given fraction.i. 2/3 of 30ii. 7/11 of 22

Answer»

i. \(\frac{2}{3}\) x 30 So, we take \(\frac{1}{3}\) of 30, twice

\(\frac{1}{3}\) x 30 = 10, twice of 10 is 2 x 10 = 20

It means that \(\frac{2}{3}\) x 30 = 20

ii. \(\frac{7}{11}\) x 22 So, we take of 22, 7 times

\(\frac{7}{11}\) x 22 = 2, seven times of 2 is 2 x 7 = 14

194.

What is 1/4 of each of the collections given below:(1) 20 marbles (2) 12 pens (3) 24 notebooks (4) 8 ladoos

Answer»

(1) 5 marbles 

(2) 3 pens 

(3) 6 notebooks 

(4) 2 ladoos

195.

Shubham Painted 2/3 of the wall space in his room. His sister Madhavi helped and painted 1/3 of the wall space. How much did they paint together?

Answer»

Space painted by Shubhan = 2/3 of the room

Space painted by Madhavi = 1/3 of the room

Hence, together they painted = (2/3 + 1/3) of the room

= 1 = the complete wall.

196.

What is 1/6 of each of the following:(1) 18 bananas (2) 12 gms (3) 30 metres (4) 24 ₹

Answer»

(1) 3 bananas 

(2) 2 gms 

(3) 5 metres 

(4) 4 ₹

197.

Simplify: (2/3) × (5/44) × (33/35)

Answer»

(2/3) × (5/44) × (33/35)

By the rule Multiplication of fraction,

Product of fraction = (product of numerator)/ (product of denominator)

Then,

= (2×5×33)/ (3×44×35)

On simplifying we get,

= (1×1×11) / (1×22×7)

= (11/154)

= (1/14)

198.

Simplify: (12/25) × (15/28) × (35/36)

Answer»

(12/25) × (15/28) × (35/36)

By the rule Multiplication of fraction,

Product of fraction = (product of numerator)/ (product of denominator)

Then,

= (12×15×35)/ (25×28×36)

On simplifying we get,

= (1×3×5) / (5×4×3)

Again simplifying we get,

= (1×1×1)/ (1×4×1)

= (1/4)

199.

Simplify: (10/27) × (28/65) × (39/56)

Answer»

(10/27) × (28/65) × (39/56)

By the rule Multiplication of fraction,

Product of fraction = (product of numerator)/ (product of denominator)

Then,

= (10×28×39)/ (27×65×56)

On simplifying we get,

= (10×1×3) / (27×5×2)

Again simplifying we get,

= (1×1×3)/ (27×1×1)

= (3/27)

=9

200.

Divide: [5(5/9)] by [3(1/3)]

Answer»

[5(5/9)] by [3(1/3)]

The above question can be written as,

= [5(5/9)] ÷ [3(1/3)]

Convert mixed fraction into improper fraction,

= [5(5/9)] = (50/9)

= [3(1/3)] = (10/3)

We have,

= (50/9) × (3/10)

(Because reciprocal of (10/3) is (3/10)

= (50 × 3) / (9 × 10)

= (5 × 1) / (3 × 1)

= (5/3)

= [1(2/3)]