384. 1. Memorize the following: 1728 cubic inches (cu. in.) = 1 cubic foot (cu. ft.) 27 cubic feet 128 cubic feet 2. Draw a cubic inch. = 1 cubic yard (cu. yd.) = 1 cord of wood Draw a cubic foot. 3. How can you find how many cubic inches there are in 2 cu. ft.? 4. How many cubic inches are there in 3 cu. ft.? In 3 cu. ft. and 120 cu. in.? 5. A man dug a cellar 18 ft. long, 12 ft. wide, and 6 ft. deep. How many cubic feet of earth did he remove? How many cubic yards did he remove? He was paid $.32 a cubic yard. How much did he receive for the work? 6. A trench was dug 3 ft. 6 in. (31 ft.) wide and 12 ft. deep, in which to lay a sewer. The sewer was 1 mile (5,280 ft.) long. How many cubic yards of earth were removed? 7. Find the number of cubic feet in a space 12 ft. long, 8 ft. wide, and 6 ft. deep. 8. Find the number of cubic feet in your school room. 9. A box contains 60 cu. ft. It is 5 ft. long and 4 ft. high. How wide is it? 10. A room contains 1620 cu. ft. long and 12 ft. wide. How high is it? It is 15 ft. LUMBER MEASURE 385. Lumber is measured by the board foot. A board foot is a piece of lumber one foot long, one foot wide, and one inch thick. To find the number of board feet in a piece of lumber, multiply the length of the piece in feet by the thickness of the piece in inches, and this by the width of the piece in inches, and divide the product by 12. To shorten the work use cancellation. 1. Find the number of feet of lumber in a piece of lumber 16 ft. long, 9 in. wide, and 3 in. thick. 4 MODEL: 16 × 9 × 3 12 = 36, the number of board feet. = 2. Find the number of feet of lumber in 12 pieces, each 16 ft. long, 8 in. wide, and 1 in. thick. 3. Find the number of board feet in a timber 20 ft. long, 8 in. wide, and 8 in. thick. 4. Find the number of board feet of flooring in the floor of your schoolroom. 5. At $12 per thousand feet, what will be the cost of 20 pieces, each 10 ft. long, 4 in. wide, and 2 in. thick? 6. Find the cost of lumber at a neighboring lumber yard. CASH ACCOUNT 386. A cash account is a written statement of cash received and cash paid out. 387. 1. The left-hand side, or debit side, of a cash account shows the cash received and from what sources it was received. 2. What does the right-hand, or credit side, of a cash account show? 3. Why should one keep a cash account? 4. What is meant by the entry "On hand $8.75"? 5. The above was Mr. A's cash account from January 1 to January 25, 1905. How much cash did Mr. A receive during this time? 6. With the $8.75, how much cash must be accounted for? 7. What did Mr. A do with his money? 8. How much money had Mr. A on hand Jan. 25? 9. What is meant by "Balance"? 10. This was Harry's cash business for the month of February, 1904. Rule your paper, make up, and close Harry's account. Feb. 1 Harry had on hand $.45; Feb. 2 he paid out for papers $.35, and received for papers $.70; Feb. 3 he received for weeding a garden ("for labor") $.60; Feb. 4 he paid for papers $.60, and received for papers $1.20; Feb. 8 he paid $.10 carfare, and received for delivering a package $.35; Feb. 9 he bought a book for his sister, paying $.20; Feb. 12 he earned $1, and spent for carfare $.20. 11. Make similar accounts. ANGLES 388. An angle is the opening between two lines. that meet. Angle Right Angle Acute Angle Obtuse Angle 1. Join two lines at a point not at the ends of the lines. How many right angles is it possible to make with two lines thus joined? How many obtuse angles? How many acute angles? 2. A right angle is an angle formed by the meeting of one straight line perpendicular to another. 3. An acute angle is an angle that is less than a right angle. 4. An obtuse angle is an angle that is greater than a right angle. 5. How many angles has a square? An oblong? What kind of angles are they? 6. Draw a circle on the blackboard. Divide it into fourths. How many right angles are there in the circle? 7. In the figures on page 64, which angles are right angles? 8. The line that bounds a circle is called its circumference. 9. Angles are measured in degrees. The angles of a circle are measured on its circumference. There are 360 degrees in a circle. 10. How many degrees are there in a right angle? In one half of a right angle? 11. Divide a right angle into three equal angles. How many degrees are there in each of these angles? 12. An angle of 180 degrees is equal to two right angles. Explain why there are 180 degrees from the north pole to the south pole. 13. Explain the use of meridians and parallels. 389. CIRCULAR MEASURE 60 seconds (") = 1 minute (') 60 minutes = 1 degree (°) 360 degrees = 1 circle |