1, 3 and 7
3.1415926535148794929
find the pime fatorasion
1,270,2,135
Math teachers
21 = 3 x 7. Both these factors are prime.
no
The prime factor decomposition of 84 is: 2 x 2 x 3 x 7 If you want to see my working (in case I made a mistake): 84/2=42 (42 is not prime), 42/2=21 (21 is not prime), 21/3=7 (7 is prime, so stop here) factors: 2,2,3 and 7
3 is a prime factor of 12 and of 21.
2 x 3 x 7 = 42
2 x 2 x 17 = 68
2*2*3*3*3 = 108
21 is not a prime factor, it is 3 x 7