(1)) What is the least common multiple (LCM) of 5 and 15 ? (4) LCM of 5 and 15 is

The least common multiple (LCM) of 5 and 15 is 15. This is because 15 is the smallest number that both 5 and 15 can divide into without leaving any remainder. You can find the LCM by listing the multiples of each number—multiples of 5 are 5, 10, 15, 20, etc., and multiples of 15 are 15, 30, 45, and so on. The first common multiple is 15! Finding the LCM can also be fun with prime factorization! For 5, the prime factor is simply 5 itself, and for 15, it’s 3 and 5 (since 15 = 3 x 5). To get the LCM, you multiply each prime factor the greatest number of times it appears in the factorizations, which gives us 3 x 5 = 15. So whether you go the multiples route or the factorization way, you still land on the same fabulous number: 15!