2 and 10 5 and 10 Both have an LCM of 10.
2 and 5 are both prime numbers. If you multiply them together, the answer is 10. 10 is the LCM of 2 and 5.
3 and 8 8 and 12
You need at least two numbers to find an LCM and there can only be one least common. If you want to know multiples of 105, just keep adding 105. 105, 210, 315 and so on.
factoring 16=2*2*2*2 105=3*5*7 no common factors so its simple 16*105=1,680 is LCM
100 is your answer
This will be difficult to answer accurately if we don't know the given number, so we'll make one up. 36. Two pairs of numbers with an LCM of 36 are 4,9 and 12,18.
50 = 5*5*2 105 = 5*7*3 so LCM = 5*5*2*7*3 = 1050 1050 = 21*50 and 10 * 105 The LCM is 1050.
Two pairs of numbers with 105 as their least common multiple are (15, 105) and (21, 105). This means that both pairs of numbers are multiples of 105 and their only common multiple is 105. The least common multiple is the smallest number that both numbers can divide evenly into.
15 and 7
There's no general rule to answer this. Presumably you're looking at specific factor pairs which you didn't see fit to share with us. I'll take a guess. (3,10) and (5,6) have the same LCM.
There are a whole lot of pairs. 2 and 35 is one pair.