2 x 3 = 6
3 x 5 = 15
2 x 2 x 5 = 20
2 x 2 x 3 x 5 = 60, the LCM
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The multiples of 15 are 15, 30, 45, 60, 75, 90 The LCM of 15 and 90 is 90. The factors of 15 are 1, 3, 5, 15 The factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 The GCF is 15.
The GCF is 6. That makes the LCM 42.
Since 15 is a factor of 75, it is automatically the GCF. Since 75 is a multiple of 15, it is automatically the LCM.
The GCF is 2. The LCM is 240.
The GCF is 6.