Question
Give the prime factorization of the following number:
420
420
✓
Answer
We will use the didvision method as shown below:
$\begin{array}{c|c}2&420\\\hline2&210\\\hline3&105\\\hline7&35\\\hline5&5\\\hline&1\end{array}$
$\therefore420=2\times2\times3\times7\times5\times1$
$=2^2\times3\times7\times5$
$\begin{array}{c|c}2&420\\\hline2&210\\\hline3&105\\\hline7&35\\\hline5&5\\\hline&1\end{array}$
$\therefore420=2\times2\times3\times7\times5\times1$
$=2^2\times3\times7\times5$
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