The multiples of 7. Answer: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98, 105, 112, 119, 126, 133, 140, 147, 154, 161, 168, and more
These are all factors of 28. Let's list out the factors of 28: 1, 2, 4, 7, 14, 28. Each of the numbers in this list are factor pairs. We can move from the outsides to the center and pair the numbers together to make sets of numbers that will multiply to make 28.