(0 x 9) + 8 = 8

(9 x 9) + 7 = 88

(98 x 9) + 6 = 888

(987 x 9) + 5 = 8888

(9876 x 9) + 4 = 88888

(98765 x 9) + 3 = 888888

(987654 x 9) + 2 = 8888888

(9876543 x 9) + 1 = 88888888

(98765432 x 9) + 0 = 888888888

(987654321 x 9) - 1 = 8888888888