PART II

PRELIMINARY REVIEW

277. 1. The following table shows the number of days' attendance in the graded schools of a certain city.

Find the total attendance for each month; then find the total attendance in each school; then find the total attendance in all the schools during the year, by adding the totals for each month, and also by adding the totals for each school.

SCHOOL

Totals

SEPT. OCT. Nov. DEC. JAN. FEB. MAR. APR. MAY JUNE for each school

2. Find the average monthly attendance for each school. How much greater was it for the Greeley School than for the Longfellow School?

3. Find the average attendance at all the schools for each month. How much greater was it for January than for December?

4. Find the average daily attendance for all the city schools, regarding 200 days as a school year.

43. What is an even number? an odd number?

Which of the numbers in exercises 27-42 are even? odd?

68. What may be done to the terms of a fraction without changing its value?

69. What are similar fractions?

70. What must be done to fractions that are not similar before they can be added or subtracted?

Perform the operations indicated:

100. Tell why

+1=1. Why is the divisor inverted?

×

101. Compare within two ways, as follows: (a) Find how much greater or less is than . (b) Find how many times contains.

102. Compare within two ways.

103. The standard size adopted for common brick is 8 in. by 4 in. by 24 in. Find the volume of a brick of standard size. 104. How much greater or less in volume is each of the following than a brick of the standard size:

Milwaukee brick, 8 in. by 43 in. by 2§ in.?
Maine brick, 71⁄2 in. by 33 in. by 2ğ in.?
North River brick, 8 in. by 3 in. by 24 in.?

105. To how many standard bricks are 1000 Milwaukee bricks equivalent in volume? 1000 North River bricks?

Reduce to a common fraction in its lowest terms:

128. .3125 129. .00875 130. .01025 131. .000225

Reduce to a decimal to the nearest thousandth:

132.

133.

134.11

135.

136.

278. 1. If a flour mill turns out 30 barrels of flour per hour and runs continuously from 7 A.M. on Monday to 12 M. on Saturday, how many barrels will it turn out in a year of 52 weeks?

2. A man's gas meter registered 28,470 cubic feet on Jan. 1 and 35,670 cubic feet on Apr. 1. Find the cost of his gas for the quarter, at 90 per 1000 cubic feet.

3. Find the freight charges on a car load of steel shipped from Pittsburg to Montreal, weight 48,200 pounds, at 201 per 100 pounds.

4. The average weight of a newspaper having a daily circulation of 240,000, half of which are sent by mail, is 27 ounces. Find the cost of postage, at 1¢ per pound, for a day; for a year of 313 week days.

5. The "Twentieth Century Limited" made a run of 133.4 miles between Toledo, Ohio, and Elkhart, Ind., in 1 hr. 54 min. How many miles per hour did the train run?

6. On one occasion a short run of 7.29 miles was made by an American train in 4 minutes. At what rate per hour did the train run

?

7. A tank 6 feet long, 2 feet wide, and 23 feet deep (inside dimensions) has its sides, ends, and bottom lined with sheet lead weighing 3 pounds per square foot. Find the cost of the lead at 6¢ per pound.

8. Find the cost of draining a meadow by laying 3960 feet of tile at $10 per thousand feet, and digging and filling 3960 feet of ditch at 331 per rod.

9. The meadow contained 621 acres.

Before it was drained

it was worth $2125, and after it was drained it was valued at $3900. How much per acre was its value increased by drainage?