Ten years make a decade, and one hundred years make a century, but these terms are not used in arithmetical calculations.

The four thirty-day months may be remembered easily by the following old rhyme:

"Thirty days hath September,

April, June, and November."

February has 28 days, with 29 in leap year. The other months have 31 days.

Oral

1. How many minutes are there in a working day of 8 hr.?

2. A man who works for 30 an hour receives how much a minute?

3. A train that is running at the rate of 2 miles in 3 minutes goes how many miles in an hour? In 10 hours? In 24 hours?

4. A boy who is idle 15 minutes in every hour wastes what part of his time?

5. How many hours are there in a week? In the month of June?

6. How many hours have we for work in a morning session of school if it begins at 9 o'clock and closes at 11.45, allowing a quarter of an hour for recess?

7. How many days are there in the fall months?

1. Name three articles that are sold by the dozen. 2. Name three articles that are sold by the gross. 3. The term score is not used in arithmetical calculations. We should remember that it means twenty, because the word occurs often in speech and in print.

"Four-score and seven years ago" was how many years ago? Do you know who used that expression, and where and when?

4. When your school board pays 60¢ a gross for pens, how much is paid per dozen?

5. How much is received for a gross of coat hooks, when they are sold at 10¢ a dozen?

6. A merchant buys screws at 20¢ a gross and sells them at 5¢ a dozen. What is his profit on 2 gross?

7. How many Seiler's tablets are there in a box containing ten gross?

8. Clothespins bought at 50¢ a gross and sold at 1¢ apiece yield what profit on a gross?

9. A gross of tennis balls will cost how much, at $3 a dozen? How much apiece would that be?

10. A case of eggs contains 30 dozen. gross is that?

How many

11. How old is your grandfather if he has lived threescore and twelve years?

12. How much will a gross of oranges cost at 40 cents a dozen?

Oral

REVIEW AND PRACTICE

1. Read 428,160,200; 1,001,010; XCVII.

2. Add 36 and 45; 73 and 27; 18 and 56; 20 and 134. 3. Subtract 32 from 85; 19 from 35; 65 from 81.

4. Multiply 26 by 10; 439 by 100; 50 by 20; 43 by 200. 5. Ella missed 5 words on Monday, 1 on Tuesday, 0 on Wednesday, 3 on Thursday, and 1 on Friday. What was the average for the week?

6. The number of hits made by the Grant School team during the nine innings of a ball game was as follows: 2, 6, 7, 5, 1, 0, 2, 0, 4. What was the average per inning?

7. How many tiles 2" X 4" will make 1 sq. ft. of hearth?

8. Give two numbers that are prime to each other.

21. A piece of ribbon 2 in. wide and 1 yd. long contains how many square inches?

22. Mr. Henderson bought half a gross of screw eyes at the rate of 10¢ a dozen. What did they cost?

23. What is the cost of 48 sheets of paper at 15¢ a quire? 24. A kitchen floor 12'x15' requires how many square yards of linoleum to cover it?

25. A pane of glass covering 63 sq. in. is ft. long. How wide is it?

Written

Add, and test by adding another way. Practice until you can do it in 5 minutes. Add two figures at once where

Have the above numbers copied on the blackboard. 23.48-17 Let pupils, one at a time, go to board and read (men5.90-14 tally) the sum of the figures in each number, from 73.84-22 left to right, putting results down as rapidly as possi6.95-20 ble. Keep a record of the time. Add two seconds for every mistake. The entire number should be taken in at a glance and the sum put down almost instantly. This is an excellent drill for concentration. Pupils at seats copy numbers and "check" their results by the results on the blackboard.

5. A man bought a ton of meal for $431 and five 80-lb. sacks of bran at $14 per sack, mixing them for horse-feed. a. How many pounds of feed had he?

b. How many hundredweight?

c. How much did it cost?

d. How many dollars did 1 cwt. of the mixture cost?

10. If 6 acres of land cost $438, how much will 42 acres cost at the same price per acre? (42 acres are how many

times 6 acres?)

11. How many loads of earth can be bought for $80 when $400 will buy 1135 loads? ($80 is what part of

19. is how many times? (7 = ? × 2)

20. Divide of by 33 times 17.

21. Divide of of × 31 by 5 of 12 of 4.

22. $68ğ will buy how many barrels of flour at $75 a barrel?

24. The area of a wall map is 9763 square inches. Its length is 42 inches. Find its width.

25. An alley between two houses is of a rod wide and 7 rods long. How many square rods of land does it contain?

26. How long will 16 bu. of corn last Fred's chickens if he feeds them 1 qt. a day?

27. 2 bbl. of cranberries, each containing 3 bu., are worth how much at 18¢ per quart?

28. The speed limit for automobiles in our city is 12 miles per hour. That is how many rods per minute? 29. What is the cost of 5 T. 500 lb. of coal at $7.40 per ton?

30. T. is equal to how many ounces?