Question

The significant digits in 20.40 are:
1) 3
2) 5
3) 2
4) 4​

Answer 1

Rules for Significant Digits:

• All the non-zero and zeros between non-zeros are considered.

• Leading zeros are neglected.

• Trailing zeros are considered only if there is a decimal point.

Considering these rules, we can say:

$\boxed{\bf 20.40 \: has \: 4 \: significant \: digits}$

• Because both the zeros are considered along with 2 and 4.