Question

Write the prime factorization of : a) 81 b) 190 c) 728

Answer 1

81 = 3x3x3x3
190 = 2x5x19
728 = 2x2x2x7x13

Answer 2

a) 81

= 9 × 9

= 3 × 3 × 3 × 3

b) 190

= 19 × 10

= 19 × 2 × 5

c) 728

= 2 × 2 × 2 × 91

= 2 × 2 × 2 × 7 ×13