Does 213 and 214 have a number in common?

Answer 1

214/3 = 71 and 1/3rd. That means that it is not a multiple of three. If you add 2+1+4 together you will get 3 if 214 is a multiple of 3. But it doesn't. It equals 7. This a quick way to figure of what are multiples of three.

Answer 2

Nope.. in order for a number to be divisible by 3, the sum of the digits must also be divisible by 3. In this case, 2+1+4 =7.

Answer 3

Just 1.