а) 11
11 * 2 = 22
11 * 3 = 33
11 * 5 = 55
11 * 7 = 77
11 * 9 = 99
б) 13
13 * 2 = 26
13 * 3 = 39
13 * 5 = 65
13 * 7 = 91
в) 17
17 * 2 = 34
17 * 3 = 51
17 * 5 = 85
г) 19
19 * 2 = 38
19 * 3 = 57
19 * 5 = 95
д) 23
23 * 2 = 46
23 * 3 = 69
23 * 4 = 92
е) 29
29 * 2 = 58
29 * 3 = 87
Ответ: а) 22, 33, 55, 77, 99; б) 26, 39, 65, 91; в) 34, 51, 85; г) 38, 57, 95; д) 46, 69, 92; е) 58, 87.