SIGNIFICANT FIGURES

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Significant figures

Significant figures indicate the of measurement which depends on the of the measuring instrument.

The reliable digits plus the first digit are known as significant digits or significant figures.

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True-False Question

Question 1

All the non-zero digits are significant.

Question 2


• All the zeros between two non-zero digits are significant, no matter where the decimal point is, if at all.

Question 3


• If the number is less than 1, the zero(s) on the right of decimal point but to the left of the first non-zero digit are not significant.

Question 4


• The terminal or trailing zero(s) in a number without a decimal point are not significant.

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Rules for Arithmetic Operations with Significant Figures

In multiplication or division, the final result should retain as many significant figures as are there in the original number with the .

In addition or subtraction, the final result should retain as many decimal places as are there in the number with the .

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Multi-choice

Question

The number 2.745 rounded off to three significant figures becomes --------------

Answers

2.74

2.75

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Question

A number 2.746 rounded off to three significant figures is ---------------

Answers

2.75

2.74

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Question

A number 2.743 rounded off to three significant figures is ---------

Answers

2.74

2.75

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