11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 121
It is 38.5, the number halfway between 33 and 44, which are the two middle numbers when they are listed in order.
It is the same number when there is the same two numbers. For example: 11, 22, 33, 44, 55, etc.
11, 22, 33, 44, and 55 are the first five multiples for eleven
22-33-44-55-66
11, 22, 33, 44, 55.
66
11, 22, 33, 44, 55
11, 22, 33, 44, 55.
The LCM of 33, 44 and 55 is 660.
They are: 11 22 33 44 and 55
1122334455