So the greatest common divisor of 1995 and 228 is 57

Verify your result using the more-phase subtraction technique:

1995-228 = 1767, 1767-228 = 1539. 1539-228=1311, 1311-228=1083,

1083-228=855, 855-228=627, 627-228=399, 399-228=171, 228-171=57, 171-57=114,

114-57=57

So the greatest common divisor of 1995 and 228 is 57 (2) Tumbling and dividing: 12155 = 5280 x 2 + 1595, 5280 = 1595 x 3 + 495, 1595 = 495 x 3 + 110, 495 = 110 x 4 + 55, 110 = 55 x 2 + 0

So the greatest common divisor of 12155 and 5280 is 55

Verify by more-phase subtraction: 12155 - 5280 = 6875, 6875 - 5280 = 1595, 5280 - 1595 = 3685,

3685 - 1595 = 2090, 2090 -1595 = 495, 495-110 = 385, 385-110 = 275, 275-110 = 165

, 165-110 = 55, 110 -55 = 55

So the greatest common divisor of 12155 and 5280 is 55