10. What is the difference between 9 tens and 6 units ? 90 6 84 a 11. What is the difference between a unit of the second order and a unit of the first order? 10 9 100 10 12. What is the difference between a unit of the third order, and a unit of the second order? 90 13. What is the difference between four units of the third order, and three tens? 400 370 EXAMPLES. 1. From the number 869 subtract 327. We begin at the right hand figure OPERATION. of the lower line, and say, 7 from 9 869 Minuend. leaves 2: set down the 2 under the 327 Subtrahend. 7. Proceeding to the next column, 542 Remainder. we say, 2 from 6 leaves 4: set down the 4, and then say, 3 from 8 leaves 5. Thus, 542 is the remainder, or true difference between the numbers. 2. From 654 subtract 472. Beginning at the lower figure on the right we say, 2 from 4 leaves 2: set down the 2. At the next step we meet a difficulty; for, we cannot subtract 7 from 5. We avoid this difficulty, thus. Ten units in the second place are equal 654 5154 to one unit of the third place § 8. 472 4 72 Therefore, if we add 10 to the 5 and 182 1 82 diminish 6 by 1 the value of the upper line will not be changed. The numbers are so written at the right. OPERATION. hundreds Orhundreds. thous. units. man erthous. huns. tens. Now, instead of saying 7 from 5, we say, 7 from 15 leaves 8: set down the 8, and then say, 4 from 5 leaves 1. The remainder is, therefore, 182. Now, if instead of diminishing the 6 by 1, we had increased the 4 under it by 1, and subtracted 5 from 6, the remainder would have been the same. Therefore, When a figure of the subtrahend is greater than the one directly over it, suppose 10 to be added to the upper figure. Let the lower figure be then taken from the number thus arising, and add 1 to the next figure of the subtrahend before it is subtracted from the figure directly above it. This is called borrowing 10. Q. When a figure of the subtrahend is greater than the one of the minuend directly above it, what do you do? What is this called ? 3. From 6354 subtract 4627. OPERATION. In this example, we say, 7 from 14 leaves 7:1 carried to 2 is 3, 3 from 5 leaves 2: 6 from 13 3 5 4 513414 leaves 7: 1 carried to 4 is 5, 5 from 4627 4 627 6 leaves 1. The remainder, there- 127 1 2 7 fore, is 1727. 4. From 60204 subtract 32861. In this example, we say, 1 from 4 leaves 3: 6 from 10 leaves 4: 1 carried 60204 to 8 is 9, 9 from 12 leaves 3: 1 carried 32861 to 2 is 3, 3 from 10 leaves 7: 1 carried 27343 to 3 is 4, 4 from 6 leaves 2. From these examples, we may deduce the following general RULE. § 20. I. Set down the less number under the greater, so that units shall fall under units, tens under tens, hundreds under hundreds, &c., and draw a line beneath them. II. Then, beginning at the right hand, subtract each figure from the one directly over it, and set down the remainder. IJI. But if the upper figure be the least, suppose it to be increased by 10: then make the subtraction, set down the remainder, and carry 1 to the next figure of the subtrahend. OPERATION, PROOF. Add the remainder to the subtrahend. If their sum is equal to the minuend the work may be regarded as right. Q. How do you set down the numbers for subtraction? Where do you begin to subtract? How do you subtract? How do you prove subtraction ? 9. From 2637804 take 2376982. Ans. 10. From 3762162 take 826541. Ans. 2935621. 11. From 78213609 take 27821890. Ans. 12. From thirty thousand and ninety-seven, take one thousand six hundred and fifty-four. Ans. 28443. 13. From one hundred million two hundred and fortyseven thousand, take one million four hundred and nine. Ans. 14. Subtract one from one million. Ans. Ans. 10 years. APPLICATIONS. 1. Suppose John were born in eighteen hundred and fifteen, and James in eighteen hundred and twenty-five : what is the difference of their ages ? 2. A man was born in 1785: what was his age in 1830 ? Ans. years. 3. Suppose I lend a man 1565 dollars, and he dies, owing me 450 dollars : how much had he paid me? Ans. 1115 dollars. 4. In five bags are different sums of money to the amount in all of 1000 dollars. In the first there are 100 dollars; in the seco econd, 314 dollars; in the third, 143 dollars; and in the fourth, 209 dollars : how many dollars does the fifth contain ? Ans. dollars. 5. America was discovered by Christopher Columbus in the year 1492. What number of years has since elapsed ? 6. George Washington was born in the year 1732, and died in 1799: how old was he at the time of his death? Ans. years. 7. The declaration of independence was published July 4th, 1776: how many years to July 4th, 1838 ? Ans. years. 8. By the census of 1840, it appeared, that the white population of the United States was 14,189,108, and the number of blacks 2,873,458 : how much did the white population exceed the black ? Ans. 11,315,650. 9. In 1840 there were in the State of New York 2,428,921 inhabitants, and in the State of Pennsylvania 1,724,033 inhabitants : how many more inhabitants were there in New York than in Pennsylvania ? Ans. 10. The revolutionary war began in 1775; the late war in 1812: what time elapsed between their commencements ? Ans. years. 11. In 1840 there were in New York, (which is the largest city in the United States,) 312,710 inhabitants, and in Philadelphia, (the next largest city,) 258,037: how many more inhabitants were there in New York, than in Philadelphia? Ans. 54,673. 12. A man dies worth 1200 dollars; he leaves 504 to his daughter, and the remainder to his son: what was the son's portion? Ans. dollars. 13. Suppose a gentleman has an income of 3090 dollars a year, and pays for taxes 150 dollars, and expends besides 253 dollars : how much does he lay up? Ans. dollars. 14. A merchant bought 500 barrels of flour for 3500 dollars; he sold 250 barrels for 2000 dollars : how many barrels remained on hand, and how much must he sell them for, that he may lose nothing ? Ans. 250 barrels remained, and he must sell for 1500 dollars. APPLICATIONS IN ADDITION AND SUBTRACTION. a 1. A merchant buys 19576 yards of cloth of one person, 27580 yards of another, and 375 yards of a third : he sells 1050 yards to one customer, 6974 yards to another, and 10462 yards to a third : how many yards has he remaining ? Ans. 2. A person borrowed of his neighbour at one time 355 dollars, at another time 637 dollars, and 403 dollars at another time: he then paid him 977 dollars. How much did he owe him? Ans. 418. 3. I have a fortune of 2543 dollars to divide among my four sons, James, John, Henry, and Charles. I give James 504 dollars, John 600 dollars, and Henry 725: how much remains for Charles ? Ans. dollars. 4. I have a yearly income of ten thousand dollars. I pay 275 for rent, 220 dollars for fuel, 35 dollars to the doctor, and 3675 dollars for all my other expenses : how much have I left at the end of the year? Ans. 5795. 5. A man pays 300 dollars for 100 sheep, 95 dollars for a pair of oxen, 60 dollars for a horse, and 125 dollars for & chaise. He gives in return 100 bushels of wheat worth 125 dollars, a cow worth 25 dollars, a colt worth 40 dollars, and pays the rest in cash: what amount of money does he pay? Ans. dollars. MULTIPLICATION OF SIMPLE NUMBERS. $21. If Charles gives 2 cents apiece for two oranges : how much do they cost him ? Ans. 4 cents. If Charles gives 2 cents apiece for 3 oranges : how much do they cost him? Ans. cents. |