What number would complete the pattern 16,4,12,36,9,27,44,11

This isn't very difficult to figure out, you just need to look at these numbers in pairs. So, 16 minus 4 is 12. Then the next pair of numbers, 36 minus 9 is 27. And to complete the pattern, you just have to look at the final pair: 44 minus 11 is 33. So the number that would complete the pattern is 33.Hope this helps. Let me know if you need additional help!

40 & 50 in the right corner are the complementary angles as when placed in a sum (added together) they make 90°