Question

Find the prime factors by repeated by division:
(a) 90. (b) 140
plz explain step by step ​

Answer 1

90÷2=45=》45÷3=15=》15÷3=5

so, 2,3,5 are the prime factors of 90

140÷2=70=》70÷2=35=》35÷5=7

so,2,5 and 7 are the prime factors of140