(i) This is a sequence of odd numbers. Each number increases by 2 (1+2=3, 3+2=5, 5+2=7, 7+2=9, 9+2=11). The missing number is 9. (ii) This is a backward counting sequence. Each number decreases by 1 (22-1=21, 21-1=20, 20-1=19, 19-1=18... wait, 19-1=18, but the next number shown is 17). Looking more carefully: 22, 21, 20, 19, 18, 17, 16 would be the sequence. The missing number is 19. (iii) This is a sequence counting by 10s. Each number increases by 10 (10+10=20, 20+10=30, 30+10=40, 40+10=50). The missing number is 40. (iv) This is a sequence of multiples of 11. Each number increases by 11 (11+11=22, 22+11=33, 33+11=44, 44+11=55, 55+11=66). The missing number is 44. (v) This is a doubling pattern. Each number is doubled ($5 \times 2$=10, $10 \times 2$=20, $20 \times 2$=40). The missing number is 40. (vi) This is a sequence where each number increases by 3 (2+3=5, 5+3=8, 8+3=11, 11+3=14). The missing number is 14.