d. Numbers that contain more than three nonzero digits should be rounded to

three significant figures.

e. Consider the following examples:

Original

Base

Number

Number

0.312

312

1.031

103

55.357

554

4

400

0.9

900

f. Examine the Appendix B, Table of Four-Place Logarithms. The table consists

of a series of columns and rows of four--digit numbers bordered left by a column of

two--digit numbers and uppermost by a row of single--digit numbers.

g. The first two digits of the natural number can be found in the first column.

h. The third digit of the number can be found in the uppermost row.

i. To determine the mantissa of a number, find the first two digits of the number

in the left column. Move across this row to the column headed by the third digit of the

number.

j. The four - digit number at the intersection is the mantissa of the given natural

number.

To determine the logarithm of a number, both the characteristic and the mantissa

must be found. The characteristic must be determined by inspection (or rule), and the

mantissa must be looked up in a table of "common" logarithms (a calculator may also

be used). By close examination of the following table, the determination of the

logarithm of a number should become clear.

MD0837

1-33

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