Chapter 1, Problem 1.147QP

Interpretation Introduction

Interpretation:

The quantity $\text{5 }\times {\text{10}}^{\text{-2}}\text{ mg}$ has to be subtracted from $\text{4}\text{.7}\text{mg}$ and the total number of significant figures is there has to be given.

Concept Introduction:

Conversion-factor method is the one which can be used to convert one metric unit into another.  With this, any unit can be converted to another unit by means of ratio.  The ratio that is used to convert unit is known as conversion-factor.  For example, one kilogram can be converted into gram by multiplying with 1000.

In order to solve an arithmetic calculation, the units in all the quantity must be same.