Math
posted by Mike on .
A 1/2 inch drill bit is too large for a job, while a 3/8 inch bit is too small. What size bit should be tried next?
7/16
*** 5/16 ****
3/16
9/16
is this correct

Nope. You need to convert the drillbit sizes to 16th of an inch.
A 1/2inch drill bit is 8/16 inch. The 3/8inch bit is 6/16 inch. Which of your choices is between 6/16 and 8/16?