Question

Give the prime factorization of each of the following numbers:
420

Answer 1

We will use the division method as shown below:

$\begin{array}{l}2\overline{)420}\\ 2\overline{)\text{210}}\\ 3\overline{)\text{105}}\\ 7\overline{)\text{35}}\\ 5\overline{)\text{5}}\\ \text{1}\end{array}$
∴ 420 = 2 × 2 × 3 × 7 ×5 × 1
=2²×3×5×7