Exercise 21. Problems in Addition and Subtraction 1. If you have 95 cents and buy a book for 50 cents, how much will you have left? 2. John bought 2 pounds of steak for 54 cents and a pound of butter for 57 cents. How much did he spend for both butter and steak? 3. Herbert had 321 marbles and sold 125 of them. How many did he have left? The next day he bought 35 more. How many did he then have? 4. A farmer values his farm at $7500, his livestock at $875, his furniture at $350 and his farming implements at $425. Find the total estimated value of his property. 5. An orchard contains 480 trees. Of these trees, 124 are Willow Twigs, 153 are Wine Saps and the remainder are Jonathans. How many Jonathan trees are there in the orchard? 6. A freight train consisted of 16 cars of coal, 17 cars of wheat and a caboose car. How many cars were there in the train? 7. A conductor on a street car has rung up 67 fares. There are only 43 people remaining on the car. How many have left the car since the trip began? 8. A dealer bought 4 cars of coal containing 30 tons, 29 tons, 28 tons and 30 tons. How many tons were there in all? 9. The population of London in 1916 was estimated to be 7,251,358 and that of New York 5,468,190. How much greater was the population of London than New York? 10. In 1916 the farm animals in the United States were estimated to number as follows: Horses 21,160,000; mules 4,565,000; milch cows 21,988,000; other cattle 39,453,000; sheep 49,162,000 and swine 68,047,000. Find the total number of farm animals as estimated for that year. 11. Find the total for grocery sales slips of the following amounts: $1.28; $1.00; $1.26; $2.13; $1.63; $1.45; $.46; $1.70; $.66; $2.67; $1.32; $.95; $4.05 and $1.51. 12. A room is 12 feet wide and 15 feet long. How many feet of picture molding will it take to go around the room, making no allowance for the doors and windows? 13. If there are two windows each 4 feet wide and a double door 5 feet wide, how many feet would be deducted from the molding to allow for these openings? How many feet would be left? 14. The following is a record of money earned outside of school hours by the pupils of a certain city school during one year. Find the sum of each column. Occupations Boys Girls Total Farm and Garden. .$1,506.38 $ 32.92 $1,539.30 Store... 1,128.46 38.45 1,166.91 Newspapers. 786.27 0.00 786.27 Golf, caddying 285.96 0.00 285.96 Peddling. ... 283.42 0.00 283.42 Chores and Housework. 289.87 262.81 552.68 Errands ... 220.11 123.79 343.90 Janitor Work, 174.06 0.00 174.06 Moving Pictures. 168.40 0.00 168.40 Miscellaneous 432.26 57.20 489.46 16. The following is a summary of what the pupils did with the money received. Find the total and see if it checks with the total column in problem 14. Deposited in Bank.... $2,015.10 Deposited in Home Savings Banks. 408.83 Given to Parents. 2,278.88 Clothing ... 602.26 Pleasure. 356.47 Outings.. 15.00 Machines. 39.58 Miscellaneous 74.24 Multiplication An accurate knowledge of the facts of the multiplication table is absolutely essential to accurate and rapid work in multiplication. The drills given below will help you to fix the multiplication facts more firmly. Practice on them until you can say the products for each drill in 50 seconds or write them in 70 seconds. Exercise 22. Drill 1 2 8 7 5 7 9 7 6 0 7 2 5 2 4 1 9 7 1 5 6 4 9 7 IH 100 Another interesting way for practicing on the multiplication facts is to make a cardboard slip similar to those in addition and subtraction: Cut a cardboard slip 5 inches by 1 inch. On it с write out of order the numbers 1 to 12, including 0. Label this slip C, and keep it with A and B in your 6 arithmetic. 2 I. Lay the slip beside your paper. Multiply each 0 number by 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12, as your 5 teacher may tell you, writing the product after each 1 number. 12 II. After multiplying add 2, 3, 4, 5, 6, 7 or 8 to each 7 product before writing the result. 11 4 Multiplication Game 9 III. Copy this column twice on the board. 8 Choose two teams, four on a team if you are taking 3 four "tables," five if you are taking five, etc. 10 The teams race in pairs. The first two, for example, start writing at the signal, and multiply each number by 4. When one finishes, the other must stop. Each problem correctly worked counts 1 point for the side to which the contestant belongs. The next two write the fives, the next the sixes, etc. Multiplication Race Another exciting contest in the multiplication facts is to write a row similar to the one shown below across the blackboard: 5 9 3 8 2 7 6 4 7 4 3 6 9 7 6 4 9 6 3 6 5 9 8 8 7 9 Start a pupil at each end of this row and see which one can write the most correct products by the time they come together, |