A large department store keeps on file a card like the above, filled out for each employee. Whenever an employee is late, or is reported for discourteous treatment of a customer, or makes an error, he is marked accordingly on the card. If many such charges are made against his name, he is warned by the head of his department; and if his record shows no improvement, he is discharged. Employees whose records are free from such charges are considered for promotion when an opening occurs. If you go into business, your record will be noted, either in a similar way or mentally, by your employers. What qualities besides promptness will help you to succeed in business or in other work? Which of these qualities does arithmetic give you the opportunity to develop? Pupils in this grade should aim for absolute accuracy in all their figuring. In the business world no other standard is accepted. 2. Short Methods in Computing One way of acquiring accuracy is to have a short method of work that may be used either for solving a problem or as a means of checking a result found in some other way. I In adding 78 and 24 without a pencil, it is convenient to think: 782098. 984 102. In adding $3.40 to $5.70, it is convenient to think: $5.70 + $3.00 = = $8.70. $8.70 + $.40 = $9.10. When shopping, a woman bought one pair of gloves for $1.75 and another pair for $2.50. In finding the amount due, she thought: $1.75 + $2.00 $3.75 + $.50 = —. = Review page 17, then give a short way of multiplying 24 by 25. By 121. By 163. By 333. By 663. [With pencil.] Multiply the numbers in each column by the number in black type at the top, using a short method wherever it is convenient: In adding or subtracting numbers where fractions occur, it is sometimes convenient to change the common fractions to decimals and sometimes convenient to add or subtract the fractions after reducing them to a common denominator. Solve each of the following problems by the most convenient method: 13. Multiply by 4.5:1 24; 460; 1580; 16.48; 284.9; .074. IV Find answers, using a short cut wherever possible: 10. 48000 3000 1. 720 × 33 = ? 2. 8000 X 25 3. 2400 × 121 4. × 640 = = ? = ? ? = ? = II. (8000+ 5500) ÷ 500 = ? 12 25 16. 8 × 1 × 120 = ? 9. 1500 ÷ 11/2 = ? Find answers, writing as few figures as possible: 1 Since it is easier to divide by 2 than to multiply by 5, it is often convenient to write such a multiplier as 4.5 as 41. For a similar reason, it is often convenient to write 3.25 as 34, and .75 as . filled out by a Iclerk when the purchase is made. It gives the date, the clerk's number or initials, the amounts and prices of goods sold, and the total amount of the purchase. By the aid of carbon paper, two or more copies are made at one time. One is kept by the clerk as the record of the sale; another is taken by the H. J. TOMLINSON HARDWARE, TINWARE, PAINTS, BICYCLES, SPORTING GOODS AND KODAKS |