What must be multiplied with 5 7 to get 4 . Let us calculate.

We need to find, what must be multiplied with 5 7 to get 4 . Let the unknown number be x . Now, 5 7 × x = 4 ⇒ 5 x = 28 ⇒ x = 28 5 or 5 3 5 Hence, the unknown number is 28 5 or 5 3 5 .

What must be multiplied with 5 7 to get 4 . Let us calculate.

We need to find, what must be multiplied with 5 7 to get 4 . Let the unknown number be x . Now, 5 7 × x = 4 ⇒ 5 x = 28 ⇒ x = 28 5 or 5 3 5 Hence, the unknown number is 28 5 or 5 3 5 .

2 3 , 4 5 and 2 3 × 4 5 - Let's calculate which one of these is of the least value.

Given, 2 3 , 4 5 and 2 3 × 4 5 Now, we need to calculate which one of these is greatest. The product of two given fractions is a fraction whose numerator is the product of the numerators of the given fractions and whose denominator is the product of the denominators of the given fractions. Then, 2 3 × 4 5 = 8 15 To compare given fractions 2 3 , 4 5 and 8 15 make their denominators same. That is, LCM of denominators 3 , 5 and 15 is 15 . Now, 2 3 × 5 5 = 10 15 , 4 5 × 3 3 = 12 15 If the denominators are the same, then the fraction with the smaller numerator is the smaller fraction. Then, here 8 15 has the least value. Hence, 2 3 × 4 5 has the least value among 2 3 , 4 5 and 2 3 × 4 5 .

5 2 , 7 3 and 5 2 × 7 3 : Calculate which one of these is greatest.

Given, 5 2 , 7 3 and 5 2 × 7 3 Now, we need to calculate which one of these is greatest. The product of two given fractions is a fraction whose numerator is the product of the numerators of the given fractions and whose denominator is the product of the denominators of the given fractions. Then, 5 2 × 7 3 = 35 6 To compare given fractions 5 2 , 7 3 and 35 6 make their denominators same. That is, LCM of denominators 2 , 3 and 6 is 6 Now, 5 2 × 3 3 = 15 6 , 7 3 × 2 2 = 14 6 If the denominators are the same, then the fraction with the greater numerator is the greater fraction. Then, here 35 6 is the greatest fraction. Hence, 5 2 × 7 3 is the greatest among 5 2 , 7 3 and 5 2 × 7 3 .

Mother gave me 5 6 th part of ₹ 60 and my elder brother 7 9 th part of ₹ 45 . Let's find, to whom mother gave more money.

5 6 th part of ₹ 60 = 5 6 of 60 = 5 6 × 60 = 50 My mother gave ₹ 50 to me 7 9 th part of ₹ 45 = 7 9 of 45 = 7 9 × 45 = 35 My mother gave ₹ 35 to my elder brother Hence, by comparing my mother gave more money to me.

E M B I B E

GANITPRABHA (MATHEMATICS TEXT BOOK) CLASS 7>Chapter 1 - Revision of Previous Knowledge>Let's do ourselves>Q 8)

EASY

7th West Bengal Board

IMPORTANT

Earn 100

What must be multiplied with $\frac{5}{7}$ to get $4$ . Let us calculate.

Important Questions on Revision of Previous Knowledge

EASY

7th West Bengal Board

IMPORTANT

GANITPRABHA (MATHEMATICS TEXT BOOK) CLASS 7>Chapter 1 - Revision of Previous Knowledge>Let's do ourselves>Q 9)

$\frac{2}{3}, \frac{4}{5}$ and $\frac{2}{3} \times \frac{4}{5} -$ Let's calculate which one of these is of the least value.

EASY

7th West Bengal Board

IMPORTANT

GANITPRABHA (MATHEMATICS TEXT BOOK) CLASS 7>Chapter 1 - Revision of Previous Knowledge>Let's do ourselves>Q 10)

$\frac{5}{2}, \frac{7}{3}$ and $\frac{5}{2} \times \frac{7}{3}$ : Calculate which one of these is greatest.

MEDIUM

7th West Bengal Board

IMPORTANT

GANITPRABHA (MATHEMATICS TEXT BOOK) CLASS 7>Chapter 1 - Revision of Previous Knowledge>Let's do ourselves>Q 11)

The sum of $4$ times of a number and half of it is $1 \frac{2}{3}$ . Let us find the number.

EASY

7th West Bengal Board

IMPORTANT

GANITPRABHA (MATHEMATICS TEXT BOOK) CLASS 7>Chapter 1 - Revision of Previous Knowledge>Let's do ourselves>Q 12)

The fraction $(\frac{1}{2} - \frac{1}{3})$ included in $(\frac{1}{2} + \frac{1}{3})$ is _____ times.

MEDIUM

7th West Bengal Board

IMPORTANT

GANITPRABHA (MATHEMATICS TEXT BOOK) CLASS 7>Chapter 1 - Revision of Previous Knowledge>Exercise 2>Q 1

Ujjwalbabu got

₹ 50, 000

from his office. He donated half of the money for the development of the local primary school. He spent

\frac{1}{5} th

of the remaining money for fencing his garden. He deposited half portion of the money left, in a Bank as fixed deposit in his wife's name and the remaining half part he keeps in Post Office for himself. Let's calculate how much money Ujjwalbabu donated or invested under different heads.

MEDIUM

7th West Bengal Board

IMPORTANT

GANITPRABHA (MATHEMATICS TEXT BOOK) CLASS 7>Chapter 1 - Revision of Previous Knowledge>Let's workout>Q 1

Sitara Begam had