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# Modern Arithmetic III, Article 3

To complete this lesson, complete the following tasks:

1.   Study the lesson for mastery.
2.  Memorize the lesson that it may be recited.
3.  Review lessons 1 and 2.
4.  Complete the lesson assessment.

## Lesson

1.  What are we studying in Article 3 of Modern Arithmetic III?
In Article 3 of Modern Arithmetic III, we are studying units of the first order, which are simply called “units”.

2.  What do we call a unit?
A unit is a single thing, called “one”.

3.  How do we signify the number one in Arabic notation?
In Arabic notation, we signify the number one with the figure 1.

4.  What do we mean by the number “two”?
One unit and one more are two.

5.  How do we signify the number two in Arabic notation?
In Arabic notation, we signify the number two with the figure 2.

6.  What do we mean by the number “three”?
Two units and one more are three.

7.  How do we signify the number three in Arabic notation?
In Arabic notation, we signify the number three with the figure 3.

8.  What do we mean by the number “four”?
Three units and one more are four.

9.  How do we signify the number four in Arabic notation?
In Arabic notation, we signify the number four with the figure 4.

10.  What do we mean by the number “five”?
Four units and one more are five.

11.  How do we signify the number five in Arabic notation?
In Arabic notation, we signify the number five with the figure 5.

12.  What do we mean by the number “six”?
Five units and one more are six.

13.  How do we signify the number six in Arabic notation?
In Arabic notation, we signify the number six with the figure 6.

14.  What do we mean by the number “seven”?
Six units and one more are seven.

15.  How do we signify the number seven in Arabic notation?
In Arabic notation, we signify the number seven with the figure 7.

16.  What do we mean by the number “eight”?
Seven units and one more are eight.

17.  How do we signify the number eight in Arabic notation?
In Arabic notation, we signify the number eight with the figure 8.

18.  What do we mean by the number “nine”?
Eight units and one more are nine.

19.  How do we signify the number nine in Arabic notation?
In Arabic notation, we signify the number nine with the figure 9.

20.  Why are these nine characters called “significant figures”?
These nine characters are called significant figures, because they denote something.

21.  What is signified by the character 0?
The character 0, called zero, stands for nothing; its use is to fill vacant orders.

22. What does a figure represent when it stands alone or in the first place at the right of a number?
When a figure stands alone or in the first place at the right of a number, it represents one or more units of the first order.

23. What are units of the first order called?
Units of the first order are called simply “units”.

24.  What is the place units occupy called?
The place units occupy is called “the units’ place”.

## Assessment

Modern Arithmetic III, Article 03 Exam