How many significant digits are in the number 0.00120?
Three significant digits (i.e.
In any number figure, the number of digits in the figure that are important in determining its value are called significant.
Zeros are included only if they contribute to the value of the number. Zeros before the first significant digit, if to the left of decimal point are ignored and similarly zeros to the right of number after decimal point are not included. Leading zeros are not significant but trailing zeros, those to the right of the last non-zero digit, are significant.
For example, in the number