help doing math in GCHEM!

[PreDental88]

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Hey,

Does anyone know an easy way of doing the math for a problem that uses a ratio?

For instance:

(1 x 10^-12) / (3.8 x 10^-7)

I understand how to work out the exponents, but I can't solve the (1/3.8) part 🙁

Any help would be greatly appreciated!

 

[UndergradGuy7]

Hey,

Does anyone know an easy way of doing the math for a problem that uses a ratio?

For instance:

(1 x 10^-12) / (3.8 x 10^-7)

I understand how to work out the exponents, but I can't solve the (1/3.8) part 🙁

Any help would be greatly appreciated!

Estimate 1/3.8 = 1/4 = 0.25

 

[Baylor2011]

(1 x 10^-12) / (3.8 x 10^-7)

You can also manipulate the numerator to: 10 x 10^-13 / 3.8 x 10^-7

3.8 - round to 4 so - 10 / 4

2 x 4 = 8, then half of 4 is 2...so 2.5

2.5 x 10^-6