1, 2, 3, 6.
1 and 2.
75.6
90 does 90 goes in twice 90 * 90 = 8100
2
The number that goes into both 84 and 105 evenly is 21.
The highest number that goes into both 90 and 147 is 3.
6 with 6 remaining 90 - 6 = 84 = 14 x 6
The highest common factor of 60 and 84 is 12
84
84
84
14 * 6 = 84 so 14 goes 6 times.