A number that divides three evenly or number that 3 is a factor Ex. 495 add them together 4+9+5=18 divide by 3 get 18/3= 6 Hope this helps

These are the first 20 multiples of 3. 3, 6, 9, 12, 15 ,18 ,21 ,24, 27,30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60