9. Find from the figures given below the world's total coffee production for a year :

10. Find from the figures given on page 9 the world's total production of petroleum for an average year:

.

United States
Russia
Mexico
Rumania
Dutch East Indies
India
Galicia
Japan and Formosa
Peru
Germany
Egypt
Trinidad
Canada
Italy.
Other countries

PRODUCTION Bbl., 42 gal. 281,104,104 68,548,062 32,910,508 12,029,913 12,386,808 8,202,674 4,158,899 3,118,464 2,487,251

995,764 221,768 750,000 215,464 39,548 10,000

11. Find from the following figures the total United States
cotton crop :
STATE

BALES
North Carolina

791,376
South Carolina

1,241,551 Georgia

2,113,459 Alabama

1,099,843 Mississippi

1,008,654 Louisiana

369,146 Texas

3,299,795 Arkansas

845,014 Tennessee

349,555 Oklahoma

671,684 Other states

173,370

.

12. From the following figures, find the world's total railway
mileage:
COUNTRY

MILEAGE
Europe

215,140
America

354,248 Asia

68,198 Africa

27,531 Australia, etc.

22,006

1

13. Find from the following figures the total number of libraries, and the total number of volumes in the libraries of the North Atlantic States :

Try the following examples by each of the methods given. Time yourself to see at what method you are most expert and accurate. Seek to perfect yourself in the use of that method.

To gain speed and accuracy in adding by groups requires constant practice. This develops a power which is of greatest service in most of the arithmetic the average person is called on to do.

13. Seven cars left Rutland, Vt., loaded with marble as follows: The first car, 36,675 pounds; the second, 36,850 ; the third, 37,200; the fourth, 37,650; the fifth, 37,150; the sixth, 38,090; and the seventh, 27,360. What was the total load ?

14. The enrollment in the common schools of certain states was found to be as follows: Illinois, 983,921; Ohio, 827,414; Missouri, 741,745; Iowa, 549,449; Indiana, 538,881 ; Michigan, 521,463; Wisconsin, 465,490; Minnesota, 429,012; Kansas, 381,595; Nebraska, 279,532; North Dakota, 124,000 ; South Dakota, 110,094. What was the total enrollment of all the states mentioned ?

15. The area of Virginia is 42,450 square miles; of Tennessee, 42,050 square miles; of Maryland, 12,210 square miles; of North Carolina, 10,200 square miles more than Tennessee ; and of Louisiana, 6270 square miles more than Virginia. What is the total area of these states ?

16. In one day a certain factory at Lowell turned out 17,200 buttons; in another, 18,560; in another, 18,570; in another, 16,500; and in another, 18,250. What was the total output for these five days?

Subtraction

Subtraction is the process of finding the difference between two numbers. The greater number is called the minuend and the smaller the subtrahend. The difference is sometimes called the remainder.

EXAMPLE

647 minuend
235 subtrahend
412 difference or remainder

In performing the work it is customary, but not necessary, to write the number to be subtracted under the other number.

Check. - Add the remainder to the subtrahend. The result is the minuend.