Answer:
1.  460
2.  216
Step-by-step explanation:
1.
From the series , 
100 , 400 , 610 , ? , 652 
Writing the the digits in the revere order , i.e 
001 , 004 , 016 , ? , 256 
Now, 
Now , getting the number in the form of the multiple of 4 as -
1  ,   1 * 4 = 4  ,   4 * 4 = 16 ,  ?  , 64 * 4 = 4  
Hence , the value for ?  =  16 * 4 =  64 .
Again , reversing 64 to get the missing number of the series -
460 .
Hence , 
The value for ? is 460 .
2.
From the series , 
342 , 128 , ? , 26
Now, multiplying the first digit with the second digit and merging it to the product of the second and third digit -
3 * 4 and  4 * 2 , 1 * 2 and 2 * 8 , ? 
128 , 216 , ?
Hence , 
The value for question mark = 1 * 2 and  1 * 6 = 216
Hence , 
The value for ? is 216 .