5. State number of significant figure in each number, then add and exp

1.	5. State number of significant figure in each number, then add and expressresult to an appropriate number of significant figure.7.21, 12.141, 2.45 and 0.0028
Answer» 1) 7.21 has THREE SIGNIFICANT figures. Appropriate NUMBER = 7.2 2) 12.141 has five significant figures. Appropriate number = 12.14 3) 2.45 has three significant figures. Appropriate number = 2.4 4) 0.0028 = 2.8 ×10^-3 has two significant figures. Appropriate number = 2.8 × 10^-3 Rules for Determining the Number of Significant Figures - • All the non zero numbers are included as significant figures. • A zero becomes significant if it comes between two non zero numbers. • If any NOTATION is given in exponential form then the numerical portion is counted as the significant figure. • A decimal can't change the number of significant figures.

5. State number of significant figure in each number, then add and expressresult to an appropriate number of significant figure.7.21, 12.141, 2.45 and 0.0028

Answer»

1) 7.21 has THREE SIGNIFICANT figures.

Appropriate NUMBER = 7.2

2) 12.141 has five significant figures.

Appropriate number = 12.14

3) 2.45 has three significant figures.

Appropriate number = 2.4

4) 0.0028 = 2.8 ×10^-3 has two significant figures.

Appropriate number = 2.8 × 10^-3

Rules for Determining the Number of Significant Figures -

• All the non zero numbers are included as significant figures.

• A zero becomes significant if it comes between two non zero numbers.

• If any NOTATION is given in exponential form then the numerical portion is counted as the significant figure.

• A decimal can't change the number of significant figures.

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