Page:An introduction to linear drawing.djvu/89

 ﻿the comma is tenths, the second hundredths, and the third thousandths, we may read it, 3 tenths, 8 hun- dredths, and two thousandths of an inch ; but the for- mer way is preferable.*

In Addition and Subtraction, columns of the same name should be placed under each other, and the cal- culation made as if there were no decimal fractions. The following examples will show the use of this rule.

Addition. Subtraction. 432,178	324,15	30,4 17,231	187,3	19,28 9,4		- 83,502	136,85	11,12 7,08		549,391			Add the following sums : 36,075	8,1	4,44 9,6	28,04	8,176 345,56	686,008 .	0,43 86,115	5,16	10,08 6,8	82,686	2,5

Subtract the following : 68,06	4,85	15,908

17,67	3,9	12,819

The master or monitor may vary such sums at pleasure.

Konths, &c. but for ordinary uses we seldom come down to so small a fraction.
 * After thousandths, come ten thousandths, hundred thousandths, mil-