Express the 21-5 as a Decimal form-

The decimal form of 21/5can be changed as follows,21/5=21× 2/5× 2 (multiply and devide by 2)0ex0ex =42/100ex0ex =4.2Hence, decimal form of 21/5 is 4 ...

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Standard IX

Mathematics

Decimal Form of Fractions Having 3, 6, 7 and 9 as Denominators

Express the 2...

Question

Express the $\frac{21}{5}$ as a Decimal form.

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Solution

The decimal form of $\frac{21}{5}$ can be changed as follows,
$\frac{21}{5} = \frac{21 \times 2}{5 \times 2} (m u l t i p l y a n d d e v i d e b y 2) = \frac{42}{10} = 4.2$
Hence, decimal form of $\frac{21}{5}$ is $4.2$

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Express the 215 as a Decimal form.

The decimal form of 215can be changed as follows,215=21×25×2(multiplyanddevideby2)=4210=4.2Hence, decimal form of 215 is 4.2

Express the $\frac{21}{5}$ as a Decimal form.

The decimal form of $\frac{21}{5}$ can be changed as follows,
$\frac{21}{5} = \frac{21 \times 2}{5 \times 2} (m u l t i p l y a n d d e v i d e b y 2) = \frac{42}{10} = 4.2$
Hence, decimal form of $\frac{21}{5}$ is $4.2$