Answer:
2) 7, 14, 21, 28, 35, 42, 49, 56, 63, 70
3) 20, 18, 16, 14, 12, 10, 8, 6, 4, 2
4) 6, 11, 16, 21, 26, 31, 36, 41, 46, 51
5) 10, 20, 30, 40, 50, 60, 70, 80, 90, 100
6) 6, 12, 18, 24, 30, 36, 42, 48, 54, 60
7) 9, 18, 27, 36, 45, 54, 63, 72, 81, 90
8) 16, 18, 20, 22, 24, 26, 28, 30, 32, 34
9) 18, 27, 36, 45, 54, 63, 72, 81, 90, 99
10) 8, 16, 24, 32, 40, 48, 56, 64, 72, 80
11) 11, 13, 15, 17, 19, 21, 23, 25, 27, 29
12) 12, 14, 16, 18, 20, 22, 24, 26, 28, 30
Explanation:
Add 7 on the first one, subtract 2 on the second, add 5 on the fourth, add 10 on the fifth, add 6 on the sixth, add 9 on the seventh, add 2 on the eighth, add 9 on the ninth, add 8 on the tenth, add 2 on the eleventh, and add 2 on the twelfth.