Discussion
No. of significant figures in 0·1040 is :
Answer: B
0·1040 has four significant figures.
The rules:
- Leading zeros, before the first non-zero digit, only fix the decimal place and are not significant. The 0 before the decimal point does not count.
- Zeros between non-zero digits are significant: the 0 between 1 and 4 counts.
- Trailing zeros after the decimal point are significant: the final 0 counts.
So the significant digits are 1, 0, 4 and 0. Three would wrongly drop the trailing zero, and five or six would wrongly count the leading zero.
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