What is the GCF of 16 using list of factors?

Answer 1

The GCF is 1.
1: 1
2: 1, 2
3: 1, 3
4: 1, 2, 4
5: 1, 5
6: 1, 2, 3, 6
7: 1, 7
8: 1, 2, 4, 8
9: 1, 3, 9
10: 1, 2, 5, 10
11: 1, 11
12: 1, 2, 3, 4, 6, 12
13: 1, 13
14: 1, 2, 7, 14
15: 1, 3, 5, 15
16: 1, 2, 4, 8, 16
17: 1, 17
18: 1, 2, 3, 6, 9, 18
19: 1, 19
20: 1, 2, 4, 5, 10, 20
21: 1, 3, 7, 21
22: 1, 2, 11, 22
23: 1, 23
24: 1, 2, 3, 4, 6, 8, 12, 24
25: 1, 5, 25
26: 1, 2, 13, 26
27: 1, 3, 9, 27
28: 1, 2, 4, 7, 14, 28
29: 1, 29
30: 1, 2, 3, 5, 6, 10, 15, 30
31: 1, 31
32: 1, 2, 4, 8, 16, 32
33: 1, 3, 11, 33
34: 1, 2, 17, 34
35: 1, 5, 7, 35
36: 1, 2, 3, 4, 6, 9, 12, 18, 36
37: 1, 37
38: 1, 2, 19, 38
39: 1, 3, 13, 39
40: 1, 2, 4, 5, 8, 10, 20, 40
41: 1, 41
42: 1, 2, 3, 6, 7, 14, 21, 42
43: 1, 43
44: 1, 2, 4, 11, 22, 44
45: 1, 3, 5, 9, 15, 45
46: 1, 2, 23, 46
47: 1, 47
48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
49: 1, 7, 49
50: 1, 2, 5, 10, 25, 50
51: 1, 3, 17, 51
52: 1, 2, 4, 13, 26, 52
53: 1, 53
54: 1, 2, 3, 6, 9, 18, 27, 54
55: 1, 5, 11, 55
56: 1, 2, 4, 7, 8, 14, 28, 56
57: 1, 3, 19, 57
58: 1, 2, 29, 58
59: 1, 59
60: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
61: 1, 61
62: 1, 2, 31, 62
63: 1, 3, 7, 9, 21, 63
64: 1, 2, 4, 8, 16, 32, 64
65: 1, 5, 13, 65
66: 1, 2, 3, 6, 11, 22, 33, 66
67: 1, 67
68: 1, 2, 4, 17, 34, 68
69: 1, 3, 23, 69
70: 1, 2, 5, 7, 10, 14, 35, 70
71: 1, 71
72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
73: 1, 73
74: 1, 2, 37, 74
75: 1, 3, 5, 15, 25, 75
76: 1, 2, 4, 19, 38, 76
77: 1, 7, 11, 77
78: 1, 2, 3, 6, 13, 26, 39, 78
79: 1, 79
80: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80
81: 1, 3, 9, 27, 81
82: 1, 2, 41, 82
83: 1, 83
84: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
85: 1, 5, 17, 85
86: 1, 2, 43, 86
87: 1, 3, 29, 87
88: 1, 2, 4, 8, 11, 22, 44, 88
89: 1, 89
90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
91: 1, 7, 13, 91
92: 1, 2, 4, 23, 46, 92
93: 1, 3, 31, 93
94: 1, 2, 47, 94
95: 1, 5, 19, 95
96: 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96
97: 1, 97
98: 1, 2, 7, 14, 49, 98
99: 1, 3, 9, 11, 33, 99
100: 1, 2, 4, 5, 10, 20, 25, 50, 100
101: 1, 101
102: 1, 2, 3, 6, 17, 34, 51, 102
103: 1, 103
104: 1, 2, 4, 8, 13, 26, 52, 104
105: 1, 3, 5, 7, 15, 21, 35, 105
106: 1, 2, 53, 106
107: 1, 107
108: 1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, 108
109: 1, 109
110: 1, 2, 5, 10, 11, 22, 55, 110
111: 1, 3, 37, 111
112: 1, 2, 4, 7, 8, 14, 16, 28, 56, 112
113: 1, 113
114: 1, 2, 3, 6, 19, 38, 57, 114
115: 1, 5, 23, 115
116: 1, 2, 4, 29, 58, 116
117: 1, 3, 9, 13, 39, 117
118: 1, 2, 59, 118
119: 1, 7, 17, 119
120: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120
121: 1, 11, 121
122: 1, 2, 61, 122
123: 1, 3, 41, 123
124: 1, 2, 4, 31, 62, 124
125: 1, 5, 25, 125
126: 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126
127: 1, 127
128: 1, 2, 4, 8, 16, 32, 64, 128
129: 1, 3, 43, 129
130: 1, 2, 5, 10, 13, 26, 65, 130
131: 1, 131
132: 1, 2, 3, 4, 6, 11, 12, 22, 33, 44, 66, 132
133: 1, 7, 19, 133
134: 1, 2, 67, 134
135: 1, 3, 5, 9, 15, 27, 45, 135
136: 1, 2, 4, 8, 17, 34, 68, 136
137: 1, 137
138: 1, 2, 3, 6, 23, 46, 69, 138
139: 1, 139
140: 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140
141: 1, 3, 47, 141
142: 1, 2, 71, 142
143: 1, 11, 13, 143
144: 1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, 144
145: 1, 5, 29, 145
146: 1, 2, 73, 146
147: 1, 3, 7, 21, 49, 147
148: 1, 2, 4, 37, 74, 148
149: 1, 149
150: 1, 2, 3, 5, 6, 10, 15, 25, 30, 50, 75, 150
151: 1, 151
152: 1, 2, 4, 8, 19, 38, 76, 152
153: 1, 3, 9, 17, 51, 153
154: 1, 2, 7, 11, 14, 22, 77, 154
155: 1, 5, 31, 155
156: 1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156
157: 1, 157
158: 1, 2, 79, 158
159: 1, 3, 53, 159
160: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160
161: 1, 7, 23, 161
162: 1, 2, 3, 6, 9, 18, 27, 54, 81, 162
163: 1, 163
164: 1, 2, 4, 41, 82, 164
165: 1, 3, 5, 11, 15, 33, 55, 165
166: 1, 2, 83, 166
167: 1, 167
168: 1, 2, 3, 4, 6, 7, 8, 12, 14, 21, 24, 28, 42, 56, 84, 168
169: 1, 13, 169
170: 1, 2, 5, 10, 17, 34, 85, 170
171: 1, 3, 9, 19, 57, 171
172: 1, 2, 4, 43, 86, 172
173: 1, 173
174: 1, 2, 3, 6, 29, 58, 87, 174
175: 1, 5, 7, 25, 35, 175
176: 1, 2, 4, 8, 11, 16, 22, 44, 88, 176
177: 1, 3, 59, 177
178: 1, 2, 89, 178
179: 1, 179
180: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180
181: 1, 181
182: 1, 2, 7, 13, 14, 26, 91, 182
183: 1, 3, 61, 183
184: 1, 2, 4, 8, 23, 46, 92, 184
185: 1, 5, 37, 185
186: 1, 2, 3, 6, 31, 62, 93, 186
187: 1, 11, 17, 187
188: 1, 2, 4, 47, 94, 188
189: 1, 3, 7, 9, 21, 27, 63, 189
190: 1, 2, 5, 10, 19, 38, 95, 190
191: 1, 191
192: 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 192
193: 1, 193
194: 1, 2, 97, 194
195: 1, 3, 5, 13, 15, 39, 65, 195
196: 1, 2, 4, 7, 14, 28, 49, 98, 196
197: 1, 197
198: 1, 2, 3, 6, 9, 11, 18, 22, 33, 66, 99, 198
199: 1, 199
200: 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200

Answer 2

Example: 30 and 42

1, 2, 3, 5, 6, 10, 15, 30

1, 2, 3, 6, 7, 14, 21, 42

Find the largest number that is on both lists.

6 is the GCF.

Answer 3

You can list the factors of 16, but you won't find a GCF until you list another set of factors.