Chapter 1, Problem 1.58AP

(a)

Interpretation Introduction

Interpretation:

The number $\text{25,401}$ has to be rounded off to four significant figures.

Concept Introduction:

Significant figures:  The digits that are measured in a number including one estimated digit are called as significant figures.

Rules for rounding off numbers:

1. 1) If the first number, which must be dropped is $\text{4}$ or fewer, drop it and all remaining numbers.
2. 2) If the first number, which must be dropped is five or greater, round the number up by adding one to the last digit that will be retained.

(b)

Interpretation Introduction

Interpretation:

The number $\text{1,248,486}$ has to be rounded off to four significant figures.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

The number $\text{0}\text{.001}\text{265}\text{982}$ has to be rounded off to four significant figures.

Concept Introduction:

Refer to part (a).

(d)

Interpretation Introduction

Interpretation:

The number $\text{0}\text{.123}\text{456}$ has to be rounded off to four significant figures.

Concept Introduction:

Refer to part (a).