20. The United States exported in bullion and specie, in 1838, 3508046 dollars; in 1839, 8776743 dollars; in 1840, 8417014 dollars; in 1841, 10034332 dollars. much was exported during these four years ?

How

Ans. 30736135 dollars.

21. Amount of tea consumed in the United States, during 1842, was 13482645 pounds; during 1843, it was 12785748 pounds; in 1844, it was 13054327 pounds; in 1845, it was 17162550 pounds; and in 1846 it was 16891020 pounds. What was the whole number of pounds during these five years?

Ans. 73376290 pounds.

22. The amount of coffee consumed in the United States, during the year 1842, was 107383567 pounds; in 1843, it was 85916666 pounds; in 1844, it was 149711820 pounds; in 1845, it was 94358939 pounds, and in 1846 it was 124336054 pounds. What was the whole number of pounds during these five years?

Ans. 561707046 pounds.

23. The number of acres of public land sold by the United States government, in the year 1841, was 1164796 acres; in the year 1842, it was 1129217 acres; in 1843, it was 1605264 acres; in 1844, it was 1754763 acres; and in 1845 it was 1843527 acres. What was the whole number of acres sold during these five years?

Ans. 7497567 acres. 24. The United States revenue for letter postage, under the new law, was as follows: for the year 1842, it was 3953315 dollars; for 1843, it was 3738307 dollars; for 1844, it was 3676162 dollars; and for 1845 it was 3660231 dollars. What was the whole number of dollars during these four years? Ans. 15028015 dollars.

25. In 1843, the amount of gold coined at the United States mint and branches, was as follows: At Philadel phia, 4062010 dollars; at the branch at New Orleans, 3177000 dollars; at the branch at Dahlonega, 582782 dollars; at the branch at Charlotte, 287005 dollars. How many dollars of gold coined in all?

Ans. 8108797 dollars. The sum of the numbers in each row of the following table, whether taken vertically or horizontally, or from corner to corner, is 24156. Let the pupil be required to make these 24 distinct additions.*

TABLE.

2016 4212 1656 3852 1296 3492 936 3132 576 2772 216

252 2052 4248 1692 3888 1332 3528 972 3168 612 2412 2448 288 2088 4284 1728 3924 1368 3564 1008 2808 648

684 2484 324 2124 4320 1764 3960 1404 3204 1044 2844 2880 720 2520 360 2160 4356 1800 3600 1440 3240 1080 1116 2916 756 2556 396 2196 3996 1836 3636 1476 3276 |3312 1152 2952 792 2592 36 2232 4032 1872 3672 1512 1548 3348 1188 2988 432 2628 72 2268 4068 1908 3708 3744 1584 3384 828 3024 468 2664 108 2304 4104 1944 1980 3780 1224 3420 864 3060 504 2700 144 2340 4140 4176 1620 3816 1260 3456 900 3096 540 2736 180 2376

This table is formed by multiplying the numbers in the magic square of 11, by 36

The quantity and value of teas and coffee consumed annually, from 1821 to 1846, in the United States, were as follow:

This table will afford material for as many examples in addition as the teacher may desire. Thus, he may require

the pupil to find the total number of pounds, as well as dollars, for the whole number of years given, or for any particular years within the limits of the table; and as it is very desirable for the pupil to be quick and accurate in the addition of numbers, it will be well for the teacher to extend to considerable length the exercises which may be drawn from the above statistics.

SUBTRACTION OF SIMPLE NUMBERS.

12. SUBTRACTION is taking a less number from a greater.

The greater number is called the minuend, and the ́ smaller number is called the subtrahend; the result is called the remainder or difference.

The symbol for subtraction is When this symbol is placed between two numbers, it indicates that the second is to be subtracted from the first. Thus, 8-5, denotes that 5 is to be taken from 8. The remainder being 3, we have 8-5-3.

The symbol is generally read minus; a Latin word meaning less.

What is Subtraction? What is the greater number called? What is the smaller number called? What is the result called? What symbol is used to denote Subtraction?

By using this symbol, we may form the following