## Basic College Mathematics (10th Edition)

$2^{2} \times3 \times 5 \times 7$
420 $420\div2$ = 210 $210\div2$ = 105 $105\div3$ = 35 $35\div5$ = 7 (Which is prime number) Now we write the prime factorization of 420 = $2\times2\times3\times5\times7$ = $2^{2} \times3 \times 5 \times 7$