These numbers: 1, 3, 5, 7, 15, 21, 35, 105.
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There are not two numbers that go into both 15 and 16 evenly. The only number that does is one (1).
No, they cannot. The GCF must evenly divide the LCM.
No, only these numbers do: 1, 3, 5, 7, 15, 21, 35, 105.
The first multiples of 15 are 15, 30, 45, 60, 75, and so on. The first multiples of 4 are 4, 8, 12, 16, 20, and so forth. Multiples are numbers that can be divided evenly by another number.
The least common multiple of the numbers 16, 15 and 12 is 240.
These numbers go evenly into both 800 and 160 evenly: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160.