To divide \(13\) (which can be written as \(1\) (the whole number part) and \(3\) (the fraction part)) by \(21\), we will first convert \(13\) into a mixed number.
The division can be expressed as follows:
\[ 13 \div 21 \]
This division can be performed directly:
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Convert the numbers into fractions: \[ \frac{13}{1} \div \frac{21}{1} = \frac{13}{21} \]
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The fraction \(\frac{13}{21}\) is already in its simplest form because \(13\) is a prime number and does not divide \(21\).
Thus, the result of \(13 \div 21\) is simply: \[ \frac{13}{21} \]
If you need the decimal representation, it is approximately: \[ 0.6190 \]
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