# What's the difference between these two formulas ?

Asked by Gooood (50 ) January 8th, 2010

(1.8×106) /(2×1.3×108) and 1.8×106 /(2×1.3×108)

I thought (1.8×106) /(2×1.3×108) meant whatever (1.8×106) equals over whatever (2×1.3×108) equals.

And to be honest I felt the other meant the same :( can you guys help?

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Homework question?

SuperMouse (30700 )

@SuperMouse
This is’t a question I had but I just want to know.

Gooood (50 )

Oh sorry
(1.8×10^6) /(2×1.3×10^8) and 1.8×10^6 /(2×1.3×10^8)

I missed out the powers

Gooood (50 )

they’re the same because you read right to left which means, in the second equation, doing 1.8×106 before dividing but after getting the result of the 2*...

lol, and if i’m wrong i plead having been probably 20 years since I’ve needed to actually think about it.

wonderingwhy (10755 )

It looks like a change in the order of operations. Remember PEMDAS, Please Excuse My Dear Aunt Sally

Parentheses
Exponents
Multiply
Divide
Subtract

torch81 (672 )

Doesn’t look any different to me. #.## x 10^# is scientific notation if I’m not wrong, which means its just a shorter form of writing a long number.

They should come out to the same thing. If I weren’t leaving for work right now, I’d whip out my calculator and give it a shot. But in my head the process I’d go through for each would be the same (following what @torch81 said, but I don’t think the order of multiply and divide matter, or add and subtract. I think they’re just that way for the sake of the acronym).

Dang I miss Algebra.

dee1313 (939 )

If you mean 1.8×10^6, this is more clearly written 1.8e6, to avoid the confusion that there are two parts the matissa (1.8) and the exponent (6 – in this case assume base 10).

The two equations are identical.

cam6662 (37 )

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