Question

GCD of 30 and45 using prime factorisation

Answer 1

30,45divisible by 3 then devidend is 10 ,15
then div by 5=2,3
gcd=3*5=15

Answer 2

30= 2×3×5
45= 3×3×5

as common factors are 3×5
therefore GCF = 15

hope It helped