The common factors are:
1, 2, 11, 22
The GCF of 198 and 220 is 22. The factors of 198 are 1, 2, 3, 6, 9, 11, 18, 22, 33, 66, 99, and 198. The factors of 220 are 1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, and 220. Therefore, the greatest common factor of 198 and 220 is 22. Another way to determine this is to determine the prime factors of each. The prime factors of 198 are 2, 3, 3, and 11. The prime factors of 220 are 2, 2, 5, and 11. The factors they have in common are one 2 and the 11, so their greatest common factor is the product 2 x 11 = 22.
The common factors are: 1, 5
198-22y = 220 -22y = 220-198 -22y = 22 y = 22/-22 y = -1
198 factors to [2 3 3 11] 36 factors to [2 2 3 3] Common factors are [2 3 3] = 18 198 * 36 / 18 = 396
The GCF of 132 and 198 is 66. The factors of 132 are 2x66=2x2x3x11, The factors of 198 are 198= 3x66=2x11x3x3 The GCF is 66.
The common factors are: 1, 2, 4
220 - 22 = 198
1 and 5
The common factors of 220 & 140 are: 1, 2, 4, 5, 10, 20.
2 and 5
The GCF is 5.
There cannot be a least common factor of just one number. To be common there need to be at least two numbers.