# Math

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A proton has a size of 0.000000000123 and an electron has a size of 1.4x10^-8. How many times smaller is an electron than a proton?

• Math -

proton = 1.23*10^-11
elec = 1.4*10^-8

elec/prot = 1.4/1.23 * 10^3 = 1138

• Math -

I thought the proton would have to be in the numerator and the electron would be in the denominator for you to divide?

• Math -

they ask the ratio of electron to proton. That is, how many times as big is the electron?

The proton is 1/1138 as big as the electron, meaning it is 1138 times as small.

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