5. 21.3615 by 3.15 6. 2.13615 by 31.5 7. 24 by .032 8. .819873 by 184.5 9. 9.6 by .00032 10. 819.873 by 18.45 Find the value of: 17. 2.32 x .012 × .08 18. 3.8 x .0225 x .5 19. 3.22 × 50 × .3 × 1 23. 9.33 x .33 24. 1.662331 25. .831.081 26. At $2.75 a pair, how many pairs of skates can be bought for $1100 ? 27. I paid $41.715 for 30.9 yards of carpet. How much did I pay for 1 yard? 28. At $.37 per bushel, how many bushels of oats can be bought for $13.121? 29. At 38 a yard, how many yards of ribbon can be bought for $9671? 30. At the rate of 48.875 miles a day, how many days will it take a man to ride on his bicycle a distance of 281.03125 miles? LESSON 77 1. How much will 350 celery plants cost at 30 a hundred ? 2. Find the cost of 36 articles at 25, 20¢, 121 ¢, 331¢, $$, 50¢. 3. At 12 a pound, how many pounds of cheese can be bought for $2? 50¢? 621? 871? 4. Find .621 of 160 yards. 621% of $1.60. 5. 100 times a certain number. number is 425. Find the 6. What part of .8 is .2? What part of .8 is .08? 7. The multiplicand has 3 decimal places, and the multiplier has 2. How many decimal places are there in the product? 8. What part of .4 is .25? Change .2 of a day to hours. 9. If .3 of a yard of ribbon is worth 64, how much is 1 yard worth? 2.5 yards? 10. 1 equals how many hundredths? .1 equals how many hundredths? .2 equals how many hundredths? 11. If 36 is the difference between .2 and .02 of a boy's money, how much money has he? 12. What decimal of a day is 2 hr.? 3 hr.? 4 hr. ? 6 hr. ? 13. The product has 6 decimal places, and the multiplier 2. How many decimal places has the multiplicand? 14. What part of 3.2 is .16? Reduce .1 of a day to hours. LESSON 78 1. If 10 tons of coal cost $10.50, how much will 7.6 tons cost? 2. If 9.3 yd. of cloth cost $20.925, find the cost of 90.3 yd. 3. Find the sum of .163, 25.121, 81, .61, 163, 663, .662, and .621. In business transactions C is frequently used to denote one hundred, and M one thousand. 4. How much will 4386 pounds of freight cost at $.875 per C. To change a number to hundreds, we divide it by 100, which is the same as pointing off two places at the right. Since one hundred pounds OPERATION 4386 100 = 43.86 hundreds 43.86 x $.875 = $38.377 Ans. cost $.875, 43.86 hundreds will cost 43.86 times $.875. 5. Find the cost of 248 fence posts at $17.33 per C. 6. Find the cost of 731 pounds of buckwheat flour at $2.35 a hundred. 7. Find the cost of 2625 cabbages at $4.621 per C. 1. Find the cost of 5385 bricks at $4.25 To change a number to thousands, we divide it by 1000, which is the same as pointing off three places at the right. Hence 5385 5.385 thousands. $22.886. = per M. OPERATION 5385 1000 5.385 thousands will cost 5.385 times $4.25, or 2. Find the cost of 8584 feet of boards at $13.50 per M. 3. Find the cost of 45,380 shingles at $3.50 per M. 4. Find the cost of 3660 envelopes at $2.33 per M. 5. Find the cost of 16,850 shad at $80 per M. 6. Find the cost of 6400 pounds of hay at $16.50 per ton. OPERATION 6400 2000 = 3.2 tons 3.2 x $16.50 = $52.80 Ans. 2000 pounds make a ton. Hence, to change pounds to tons we divide the number representing the quantity by 2000, which is the same as pointing off three places at the right for decimals, and dividing by 2. 6400 pounds = 3.2 tons. Hence the cost = 3.2 times $ 16.50, or $52.80 Ans. 7. Find the value of 3200 pounds of guano at $50 a ton. 8. Find the cost of 8940 pounds of coal at $ 3.75 a ton. 9. If .75 of a ton of clover hay is worth $12.60, how much is a ton worth? REVIEW WORK LESSON 80 1. What part of a quantity is 331 % of it? What is 33% of $21? 42 yards? 9g bushels? 12 gallons? 2. If a man walks 143 miles in 4 hours, at what rate does he walk per hour? 3. What is the cost of a bushel of potatoes if 13 bushels cost $8? 5 bu.? 7 bu.? 4. If 3 dozen eggs cost $.60, how much will 20 eggs cost? 5. If 8 oz. of butter are worth 16, how much must I pay for 5 pounds, 5 oz. ? 6. If 6 men can do a piece of work in 8 days, how long will it take them to do of the work? How many days will it take 3 men to do of the work? 7. What is a fraction? proper fraction? A decimal fraction? An im |