6. A man bought a horse for 125 dollars and sold it for 182 dollars; how much did he gain ? 7. A man commenced business with 5000 dollars; the first year his profits were 720 dollars, the second year 500 dollars, the third year 1000 dollars, but the fourth year he lost 2000 dollars; what was then his capital? 8. A man purchased a lot for 900 dollars and erected a house on it at the cost of 3875 dollars for the carpenter's work, 550 dollars for masonry, and the painting cost 869 dollars; he then sold the property for 6000 dollars; did he gain or lose by the transaction, and how much? Ans. Lost $194. 9. A man bought a barrel of flour for 8 dollars, three barrels of pork for 35 dollars, salt for 16 dollars, and corn for 300 dollars; he sold the whole so as to gain 20 dollars. How much did he sell it for? 10. A merchant owns property worth 264956 dollars, and owes 89635 dollars; what is the net value of his property? 11. A farmer sold eight cords of wood for 144 dollars; he received in payment cloth valued at 60 dollars, and 48 dollars cash; how much was still owing him? 12. Bought 21693 yards of calico of one merchant, 560 yards of another, and 83946 yards of a third; sold 340 yards to one customer, and 69548 yards to another; how much is still on hand? 13. Sold to one man 3246 acres of land at 6 dollars per acre, to another 4328 acres at 8 dollars per acre, to a third 9546 acres at 5 dollars per acre, and to a fourth 3261 acres at 9 dollars per acre. What was the amount of sales? MULTIPLICATION. MULTIPLICATION AND DIVISION TABLE. 1 2345678 9 10 2 4 6 8 10 12 14 16 18 20 3 6 9 12 15 18 21 24 27 30 4 36 40 8 12 16 2024 28 32 5 10 15 20 25 30 35 40 612 18 24 30 36 42 48 45 50 54 60 63 70 72 80 14 21 28 35 42 49 56 8 16 24 32 40 48 56 64 9 18 27 36 45 54 63 72 10 20 30 40 50 60 70 80 11 22 33 44 55 66 77 88 99 110 81 90 90 100 |12|24|36|48|60|72 | 84 | 96 | 108 | 120 11 22 33 44 55 12 24 36 48 60 72 84 88 96 99 108 110 120 121 132 132 144 As a Multiplication Table, begin with the first line; thus, Once 1 is 1; once 2 are 2; once 3 are 3, etc. Second line, Once 2 are 2; twice 2 are 4; 3 times 2 are 6; 4 times 2 are 8, etc. Third line, Once 3 are 3; twice 3 are 6; 3 times 3 are 9; 4 times 3 are 12, etc. Recite each line similarly. REM. 4 times 3 are 12, and 3 times 4 are 12; hence, alternating the factors does not change the product. As a Division Table, begin with the first line; thus, 1 is contained in 1, once; in 2, twice; in 3, 3 times; in 4, 4 times, etc. Second line, 2 into 2 = 1; 2 into 42; 2 into 63; 2 into 84, etc. Third line, 3 into 3 = 1; 3 into 6 = 2, etc. REM.-As a Multiplication Table, it may also be read by the column, by which the factors are alternate, without changing the product. Any number is multiplied by 10 by adding a zero to it. As a Division Table, the first column has all the divisors, the first line all the quotients, and every number in each line is a dividend, which is always in the same line and the same column with the quotient and divisor. Any number having a zero in the units place is divided by 10 by removing the zero, THEOREM I. Any number is multiplied by 10 by annexing a zero to it. Since the product of any number multiplied by 1 is equal to the number itself, the product of any number multiplied by 2 is double the number, etc. For, as 10 x 110, and 10 x 220, and 10 x 24 = 240, and as alternating the factors does not change the product, hence, 1 x 1010, and 2 x 10 = 20, and 24 x 10240. .. Any number is multiplied by 10 by annexing a zero to it. COR.-Any number is multiplied by 100 by annexing two zeros to it, and annexing three zeros multiplies it by 1000, etc. THEOREM II. The product of any two factors will have as many figures, or one less, than both factors. 1 3 3 3 4 9 12 4 4 16 9 9 81 50 500 5 5 250 2500 500 50 25000 1 The products of the smaller figures of units will be but one figure until above 3, when there will be two figures, but never more, as 9 × 981, and every additional figure annexed to each or either factor, whether small or large, will make an increase of one figure and no more; therefore the product of any two factors will have as many figures, or one less than both factors. COR. 1. The product of any two figures cannot be less than one figure, nor more than two. COR. 2. The product of units by units must be units, and when there are two figures, the left-hand figure will be tens. The product of tens by units must be tens, and when there are two figures, the left-hand figure will be hundreds; and if any order be multiplied by units, the right-hand figure of the product will be the same order as the multiplicand, and if there be two figures in the product, the left-hand figure will belong to the next higher order. COR. 3.-When the multiplier is tens, the product will be ten times as great as if the multiplier were units; that is, each product will have one zero to the right of it, holding the units place, or the first figure of the product must be placed in the column of tens; when the multi plier is hundreds, the right-hand figure must be placed in the column of hundreds; and, in general, whatever the order of the multiplier is, the right-hand figure must be in the column of that order. COR. 4.-If there be one or more zeros in the multiplier, the product of the next figure will be put back one figure for every zero. REM.—In the multiplication, each figure may be regarded as the unit of its order. PROBLEMS. 1. 10 x 10 = 100. 2. 11 x 11 = 121 = 11 × (10 + 1) = 11 x 1 = 11 11 x 10 = 110 121 3. 12 × 12 = 144 = 12 × (10 + 2) = 12 × 2 = 24 12 × 10 120 144 4. Multiply 432 by 4 2 x 4 = .. 120 30 x 4 = 1728 5. Multiply 432 by 14 = 432 × (10 + 4). .. 432 x 4 = 1728 or 432 × 10 = 4320 6048 (400 +30 + 2) × 4. and 432 4 1728 = 432 14 1728 432 6048 REM. The problems should be carefully impressed on the mind before proceeding. |