00:01
In this problem, we want to add fractions with unlike denominators.
00:04
To do that, we must first find a common denominator.
00:08
So what number do 10 and 15 having common? to do that, we must find the least common multiple.
00:15
For example, if we start with 10, we have 10, 20, 30, 40, and we could keep going.
00:27
These are all multiples of 10.
00:29
But we want to switch into 15.
00:31
So 15 has the following multiples, 15, 30, but right away we notice that we have 30 and 30.
00:40
So 30 is the least common multiple, and that's what we want to turn the 15 and the 10 into.
00:47
To do that, we see that 10 times 3 is 30...