Question

Give the prime factorization of each of the following numbers:
90

Answer 1

We will use the division method as shown below:

$\begin{array}{l}2\overline{)\text{90}}\\ 3\overline{)\text{45}}\\ 3\overline{)\text{15}}\\ \begin{array}{l}5\overline{)\text{5}}\\ \overline{)\text{1}}\\ \end{array}\end{array}$

∴ 90 = 2 × 3 × 3 × 5
= 2 × 3² × 5