1. At the Suffolk County fair the canning clubs of seven schools entered 252 jars of fruit. What was the average number for each school? 2. Of the 32 canning prizes given, the Chester Club won 12. What part of the prizes given did it win? 3. Of these 12 prizes, three were first prizes of $2.50, five were second prizes of $2.00, three were third prizes of $1.50, and one was a fourth prize of $1.00. How much did the Chester Club win? 4. Ralph Davis won the Corn Club championship with a yield of 102 bushels on his acre. How much did he receive for his corn at $1.20 a bushel? 5. It cost Ralph $52.68 to raise this corn. What was his profit? 6. The potato championship went to Henry Sheldon, whose acre yielded 15,360 lb. How many bushels was this, at 60 lb. to the bushel? 7. Jennie Andrews won first prize for a She used 3 yd. of gingham at 36¢ a yd., 60¢ a yd., and 6 buttons at 30¢ a dozen. have cost $4.50 in the store. making it? dress she made. yd. of linen at The dress would How much did Jennie save by 8. The admission to the fair was 50¢ for adults and 25¢ for children. How much was taken in on Saturday when 800 adults and 300 children attended? Checking or Proving Work In all computations in arithmetic it is important that the work should be done accurately and with reasonable speed. When you purchase several articles at a store, you will notice that the clerk goes over his work a second time to be sure it is right. This checking, as it is called, is a common practice in all branches of mathematics. When carrying through an operation a second time to check it, it is better to do it in a different way or order, if possible. For example, in addition first add from the bottom of the column upward, then check by adding downward. To secure reasonable speed, make use of the time tests given in this chapter. If you are not able at first to do the examples within the time indicated, practice on similar sets of examples until you acquire the reasonable speed suggested. |