PRACTICAL BUSINESS ARITHMETIC

CHAPTER I

ADDITION

When and how is addition used in business houses? What are the advantages to the employer of being able to add with accuracy and rapidity?

To the customer?

To the employee?

To every citizen in any employment or capacity?

1. Fundamental processes. Rapid addition depends largely upon the ability instantly to combine two or more numbers into a single number.

1. The following combinations of numbers up to 10, selected from business problems, are those upon which employees most frequently fail in daily work.

ORAL EXERCISES

(1) Pronounce at sight the sum of each group:

a. from bottom to top;

b. from top to bottom;

c. from left to right;

d. from right to left.

(2) Continue drill until sums can be named at the rate of

(3) It is as easy to add 23 and 8 as it is to add 3 and 8. 3 and 8 are always equal to 1 ten and 1 unit; hence in adding 23 and 8 think of the tens as increased by 1, call the units 1, and the result is 31.

(4) Pronounce at sight the sum of each of the following groups, and continue series work until the sight of each combination causes an automatic response.