20 Difficult Matchstick Puzzles Only People with High IQ Can Solve

The bonus question is very cool, let's see who can solve it?

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[Gatorsrq]

I got these alternates
#2 -- 13+5=18
#14 -- 31-16=15 (either "15" becomes "16")
#18 -- 79+13=92
On the finale, I get 1153

[alexreid-whgq]

#2 13 + 5 = 18; #16 91 - 5 = 86; #18 79 + 13 = 92; Big # 1153

[craigslist]

🎉👍

What I saw first:
All the same except:
#12--Just could not see it (???)
Same solutions for all the rest

Bonus--1153