Question

Which of the following numerical values has three significant figures? *
(a) 5.055
(b) 0.050
(c) 50.50
(d) 0.500​

Answer 1

Rules for Significant Digits:

• All the non-zeroes and zeroes between non-zero digits are considered significant.

• Leading zeroes (irrespective of presence or absence of decimal) are neglected.

• Trailing zeroes are significant only if there is a decimal point.

Using these rules, we can say:

0.500 has 3 significant figures.

• 5.055 : 4 significant digits.
• 0.050 : 2 significant digits.
• 50.50 : 4 significant digits.

$\star$ Hope It Helps.