First, look for a pattern. Notice how each number is 10 less than the previous number:

99,    89,    __,    69,    59

To make the pattern complete, the number 79 must go in the blank space.

First, look for a pattern. Notice how each number is 1 less than the previous number:

115, 114, 113, 112, 111, 110, __

To make the pattern complete, the number 109 must go in the blank space.

First, look for a pattern. Notice how each number is 2 less than the previous number:

__, 92, 90, 88, 86, 84, 82

To make the pattern complete, the number 94 must go in the blank space.