3 goes into 36 and 63 evenly.
2 is one such number.
4
1
Because 2 goes into 36 without remainder. 36 = 2*18
That number is 9.
6
Their HCF is 2
One and three
Their HCF is 2
GCF(36, 75) = 3 so the answer is 1 and 3
Its 12. To do this you see what number goes into 36 three times