Since five, two, and three are all prime, the lowest common denominator is 30 or 2 * 3 * 5.
210
15
The lowest common multiple of the two numbers is 430.
Since the lowest common multiple of 3 and 5 is 15, the common multiples of 3 and 5 are the multiples of 15: 30, 45, 60, 75, 90, etc...
12
They are the first five multiples of their lowest common multiple: 140, 280, 420, 560, 700.
165
The LCM or least common multiple of 3 and 5 is 15.The GCF or greatest common factor of 3 and 5 is 1.
There is no such thing as a highest common multiple of numbers, as numbers continue on forever. Note the difference between a Lowest Common Multiple (LCM) and a Highest Common Factor (HCF). The Lowest Common Multiple of 9, 7, and 5 is 315.
Fifteen is the least common multiple of three and five. 3 * 5 = 15 5 * 3 = 15
420