Yes it is because it is a multiple of 9 and both are in the 3 times table.
72 times 6 = 432
72 ... xx
18
Yes.
2 and 6 are prime factors of 72 2 times 6 times 6 = 72
12 goes into 72 six times with no remainder
1*72=728*9=7212*6=7236*2=72
12 goes into 72 6 times.
12 times 6 is: 12 * 6 = 72
72
72... 8 goes into 72, 9 times 9 goes into 72, 8 times and 6 goes into 72, 12 times