Final answer:
No, all multiples of 3 are not also multiples of 6. A multiple of 6 is a number that can be divided evenly by 6 without leaving a remainder.
Step-by-step explanation:
No, your friend is not correct. While all multiples of 6 are also multiples of 3, not all multiples of 3 are multiples of 6. A multiple of 6 is a number that can be divided evenly by 6 without leaving a remainder. For example, 12 is a multiple of 6 because 12 divided by 6 is 2 with no remainder. However, 9 is a multiple of 3 but not a multiple of 6 because 9 divided by 6 is 1 with a remainder of 3.