# Math

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(This is just an example)
A proton has a size of 1.23x10^-11 and an electron has a size of 1.4x10^-8. How many times smaller is and electron than a proton?
Now the part I need help with the which scientific notation goes in the numerator? Is it 1.23x10^-11 or the 1.4x10^-8?

• Math -

This means: how many times larger is a proton then an electron?

Thus we put the proton on the numerator and the electron on the denominator.

From pure chemical science, a proton is wayyy bigger (and heavier) than an electron. Thus, if you get an answer that is really small then you know you are wrong.

• Math -

Okay thank you. But would 0.000000000123 be 1.23x10^-11?

• Math -

Actually, that would be 1.23 x 10^-10. Move it over one more place. Count 11 places from 1.23. From 1.23 to 0.123 there is one jump.

• Math -

Would that mean that my answer would be 0.88x10^-18?

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