Find the missing number in the following series. 16, 12, 64, 16,_____,20, 256

Answer 1

Number list = 16 12 64 16 ? 20 256 (If ? = 18, the the differences are underlined)

Number Differences = -4 52 -48 2 2 236

The relationship from number to number appears to be:

12- (-4) = 16

64- 52 12

16-(-48) = 64 Since the number trend is up down up down up down etc. The missing number should be greater than 16 but less than 20. Let's try 18

20-2 = 18

18-2 = 16 Seems to work! So the missing number (?) is 18.