3
HCF(9, 12) = 3
1, 3, 9.
1, 3, 9.
1, 3, 9.
1, 3 and 9 will go into both numbers evenly
1, 2, 3, 6, 9, 18 go into 18 evenly.
1, 3, 9, 27.
only 1 and 7 can go into 7 evenly.. but 9 and 3 go into 27 evenly
3 or 9 3 goes into 9 three times and 27 nine times. While 9 goes evenly into nine and 3 times into 27
Seven and three are both prime numbers, therefore their only factors are one and itself. Nine's factors are 9,1, and 3. 3 Goes into 3 evenly, but doesnt go into 7 evenly. Therefore the only number that fits into 9, 7, and 3 evenly is 1. Hope this helps!
3 and 1 will go into both number evenly leaving no remainders.