Bob has band every 5 days. Jill has band every 6 days. How often will they have band on the same day?
+223 You need to find the least common multiple to find out how often they have band on the same day. So in other words, what is the smallest number that is divisible by both 5 and 6.
You can check the multiples of each number and find the first one that is in common, but eventually you will be able to recall very quickly what the LCM is of two common numbers.
In this case, Bob and Jill have band together every 30 days.
