The last digits in both groups are the same: 3, 6, 9, 2, 5, 8, 1, 4, 7, 0. The last digit of these multiples always repeat, which means that students can remember these digits to help them with the three multiplication tables. Three doesn’t have any rules that make its multiplication table easy to memorize, but there is a pattern for every ten multiples of three: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30
