The number 0 has one significant figure. Therefore, any zeros after the decimal point are also significant. Example: 0.00 has three significant figures. Any numbers in scientific notation are considered significant. For example, 4.300 x 10-4 has 4 significant figures.Click to see full answer. Then, what are the 5 Rules for significant figures? Significant Figures Annotation category: RULES FOR SIGNIFICANT FIGURES. All non-zero numbers ARE significant. Zeros between two non-zero digits ARE significant. Leading zeros are NOT significant. Trailing zeros to the right of the decimal ARE significant. Trailing zeros in a whole number with the decimal shown ARE significant. One may also ask, how many significant figures does 3.00 have? Numerically 3.0, 3.00, 3.000 are of the same value, but 3.000 shows that it was measured with the more precise instrument. The zeroes in all three numbers are considered “significant figures”. They are shown to indicate the precision of the measurements. If we take away the zeroes, the value does not change. Also know, how many significant figures does 100 have? The number “10.” is said to have two significant digits, or significant figures, the 1 and the 0. The number 1.0 also has two significant digits. So does the number 130, but 10 and 100 only have one “sig fig” as written.How many significant figures does 0.0560 have?Answer: the significant figures of the number 0.0560 is 3.