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Open the calculator on your computer, and type in the question, hitting enter to see each step. Now switch to scientific and enter it, watching each step.
standard:
40 + 40 = 80
* 0 = 0
+ 1 = 1
scientific
40 + 40 = 80
* 0 = 0
+ (now the number on screen jumps to 40, as ONLY in scientific maths does the order come into it) 1 = 41
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