To get the product 1- we should multiply 8-21 by a 8-21 b -8-21 c 21-8 d -21-8

Name: EXEMP - Grade 08 - Mathematics - Rational Numbers - Q12
Uploaded: 2022-07-04T10:36:42+05:30
Description: We should multiply 8/21 by x. Then, according to question, x ×8/21=1 x=21/8 Hence, we should multiply 8/21 by 21/8, for getting the product 1. nbsp; Thus, ...

We should multiply 8/21 by x. Then, according to question, x ×8/21=1 x=21/8 Hence, we should multiply 8/21 by 21/8, for getting the product 1. nbsp; Thus, ...

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Standard VIII

Mathematics

Reciprocal of a Number

To get the pr...

Question

Question 12
To get the product 1, we should multiply $\frac{8}{21}$ by

(a) $\frac{8}{21}$

(b) $\frac{- 8}{21}$

(c) $\frac{21}{8}$

(d) $\frac{- 21}{8}$

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Solution

We should multiply $\frac{8}{21}$ by $x$ .

Then, according to question,

$x \times \frac{8}{21} = 1$

$x = \frac{21}{8}$

Hence, we should multiply $\frac{8}{21}$ by $\frac{21}{8}$ , for getting the product 1.
Thus, the correct option is (c).

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The reciprocal of $\frac{- 3}{8} \times (\frac{- 7}{13})$ is
(a) $\frac{104}{21}$
(b) $\frac{- 104}{21}$
(c) $\frac{21}{104}$
(d) $\frac{- 21}{104}$

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Reciprocal of a Number

Standard VIII Mathematics

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Question 12 To get the product 1, we should multiply 821 by (a) 821 (b) −821 (c) 218 (d) −218

We should multiply 821 by x. Then, according to question, x×821=1 x=218 Hence, we should multiply 821 by 218, for getting the product 1. Thus, the correct option is (c).

Question 12
To get the product 1, we should multiply $\frac{8}{21}$ by

(a) $\frac{8}{21}$

(b) $\frac{- 8}{21}$

(c) $\frac{21}{8}$

(d) $\frac{- 21}{8}$

We should multiply $\frac{8}{21}$ by $x$ .

Then, according to question,

$x \times \frac{8}{21} = 1$

$x = \frac{21}{8}$

Hence, we should multiply $\frac{8}{21}$ by $\frac{21}{8}$ , for getting the product 1.
Thus, the correct option is (c).