Determine all the common multiples of the numbers 2, 4, and 9 up to 72.
Write all the multiples of 9 up to 72.
Circle the numbers that are also multiples of 2. Draw a square around the numbers that are also multiples of 4.
So, the common multiples of 2, 4, and 9 up to 72 are 0, 36, and 72.