557. Three times 3 tenths equals how many tenths? 558. The products are 13.6, 30, 3.3, 7, and .396; the ciphers to the right of the decimals, having no value, are omitted in giving the answers. 565. Slate Problems. 31. A franc is 19.3 cents. Find the cost in United States money of goods amounting to 1,250 francs. 32. A merchant bought 1,800 meters of silk. How many yards did he buy, a meter being 39.37 inches? 33. A kilogram is 2.2046 pounds. What is the difference in weight between the English ton of 2,240 lb. and a French ton of 1,000 kilograms? 34. A cubic foot of water weighs 1,000 ounces. How many pounds does a cubic foot of gold weigh, gold being 19.4 times as heavy as water? 35. There are 128 cubic feet in a cord. How many tons of 2,000 lb. are there in a cord of pine wood, the latter being .66 times as heavy as water? 36. A man buys three plots of ground containing 35.27, 17.8, and 40.375 acres, respectively. Find the total cost at $36 per acre. 37. How many pints are there in 2.375 gallons? 38. What decimal of a peck is a quart? 39. What will be the cost of carrying 468 tons of coal at $0.125 per ton? 40. A farmer sold one-eighth of his farm of 224.2 acres at $62.50 per acre. How much did he receive for it? 41. How long is a post which is 5 feet above water, onehalf of its length in the water, and one-fourth of its length in the mud? (Diagram.) 42. Eight pounds of black tea costing 35¢ per lb. are mixed. with twelve pounds of green tea costing 50 per lb. What is the cost of a pound of the mixed tea? 43. How many bushels, pecks, and quarts, are there in 1,449 pounds of corn weighing 56 lb. per bushel? MEASUREMENTS. 569. Preliminary Exercises. Draw a square each side of which is one inch. This is called a square inch. Draw a rectangle two inches long, one inch wide. How many square inches will it contain? Draw a rectangle three inches long, two inches wide. Divide it into one-inch squares. Count them. How many are there? How many square inches in the rectangle? How many square inches in a rectangle 6 inches long, 3 inches wide? How many square inches in a rectangle 4 inches long, 4 inches wide? About how long is your slate? About how wide? About how many square inches are there in its surface? How many square inches are there in a rectangle 12 inches long, 3 inches wide? In a rectangle 1 foot long, 3 inches wide? In a rectangle 1 foot 1 inch long, 4 inches wide? 570. Slate Exercises. How many square inches in each of the following rectangles? 571. NOTE. Change each dimension to inches before multiplying. |