The total number of digits to the right of the point are known as '**decimal points**' whereas **significant figures** start from the first non-zero number. __Note__: As significant figures start from the first non-zero number this could be to the *left* of the decimal point. We then use the laws of rounding to come up with our final answers!

d.p. = decimal points, s.f. = significant figures

__Examples:__

a) 704.539018 is 704.53902 (to 5d.p.) and 704.54 (to 5s.f.)

b) 0.0091 is 0.01 (to 2d.p.) but 0.0091 (to 2s.f.)

c) 0.100400 is 0.10040 (to 5d.p.) and also 0.10040 (to 5s.f.) because, from the first significant figure (non-zero) onwards, *all* numbers are significant. This includes zeros between non-zeros and all trailing zeros.