Lowest Common Multiple

The Lowest Common Multiple (LCM) is the lowest number which is a multiple of two or more given numbers. To find the LCM, simply write down the multiples of each number as a list until you find a number which appears in all the lists.

Example 1
Here is an example of a LCM question:

Find the LCM of 3, 5 and 10

Write down the multiples of each number as a list as shown below, and underline the first number which appears in all of the lists.

3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30

5: 5, 10, 15, 20, 25, 30

10: 10, 20, 30

The number you underlined is the Lowest Common Multiple.