1. Fill in the number of pieces of each kind in the following: Struts 18' long Stringers 281' long Trusses 8' long Braces 4' 6" long. Rafters 6" x 2" Rafters 6" x 6" KIND NUMBER 2. If no allowance is made for corners, how many linear feet of each of the following will be needed: sills, plates, purlins, ridge board? 3. What is the length of the rafters, if 18" is allowed for the overhang? (See § 147, 2 c.) 4. Fill in the following, using the table in example 1: 5. How many board feet of flooring will be used? How many board feet of plank? (No allowance for anything but sills.) 6. If no allowance is made for openings, how many board feet of " lumber will be used for siding? (For area of gable ends, see § 147, 2 a.) 7. If no allowance is made for openings, how many board feet of " lumber will be needed for the four sides and top of the granary? (Granary 38' x 29' x 16'.) × 8. Allowing for extension and overhang, find the area of the roof. 9. How many shingles laid 5" to the weather will be needed? 10. Using all previous data, fill in and extend the following: PERCENTAGE 179. Percentage (per cent by the hundred) is a commercial method of computing a fractional part, when that fractional part is hundredths. 180. The sign (%) per cent, or the decimal fraction showing hundredths, as .25 (25%), is used. 181. The table of aliquot parts on page 47 will be used for most percentage operations; e.g., 121% or .121⁄2 of a number is of it. TO THE TEACHER. Review the table of aliquot parts until the student can recognize all equivalents instantly. 182. The base is the number upon which the percentage is computed; e.g., interest is figured on the principal as the base; income upon the investment; etc. 183. The rate, or rate per cent, is a fractional part of the base to be taken. 184. The percentage is the result obtained by multiplying the base by the rate. 185. The amount is the sum of the base and the percentage; e.g., principal plus interest equals amount, etc. 186. The difference is the remainder when the percentage is subtracted from the base; e.g., cost minus loss equals selling price (remainder). NOTE. When the rate is a fractional part of 1%, as .0075 (%), find 1%, then take the fractional part of it. |