2 + 2 - 34 + 69 - 420 + 12

2 answers

Pls help
per PEMDAS and the L-R associativity of addition,
2 + 2 - 34 + 69 - 420 + 12
4 - 34 + 69 - 420 + 12
-30 + 69 - 420 + 12
39 - 420 + 12
now finish it off

of course, you could easily have used your calculator ...