1, 3 and 9.
1, 3, 7, 9, 21, 63
3 goes into 36 and 63 evenly.
1, 3, 7, 9, 21, 27, 63, 189.
2
63 can be evenly divided by 1,3.7,9,21, and 63.
Factors of 27: 1, 3, 9, 27 Factors of 63: 1, 3, 7, 9, 21, 63 So the greatest (biggest) common (same) factor (a number that can divide it evenly) is 9.
9
1, 3, 7, 9, 21, 63
3 goes into 36 and 63 evenly.
The number 63 can be evenly divided by 1, 3, 7, 9, 21, and 63.
These numbers will go into 378 evenly: 1, 2, 3, 6, 7, 9, 14, 18, 21, 27, 42, 54, 63, 126, 189, 378.
The number is 9.
The greatest common factor is 63
7 x 9 = 63
Any multiple of 315
The only whole number that can do that is ' 1 '.
The hcf is 21