150 29. Large Numbers Sometimes you need to use very large numbers like 10,736 sq. ft., or like forty thousand or a million. $450 is 45,000¢ (forty-five thousand cents). The wall of one side of your schoolroom contains about thirty thousand square inches (30,000 sq. in.). There are 86,400 seconds in a day. 1. Guess how many feet there are in 25 miles. 2. Find the right answer by multiplying. There are 5280 ft. in one mile. 3. How near did you guess? 4. Guess how many sheets of paper like this there would be in a pile two feet high. 5. Find the right answer, counting 260 sheets to an inch. 6. How near did you guess? 7. Guess how many pounds 3 empty freight cars weigh. 8. Find the right answer, counting 36,450 pounds as the weight of one freight car. 9. How near did you guess? 10. Name some place that you think is about 5000 feet from the school. About 10,000 ft. from the school. About 25,000 ft. from the school. About 50,000 ft. from the school. About 95,000 ft. or 18 miles from the school. Find the quotients. Put $ and. in each quotient to show which numbers mean dollars and which numbers mean cents. 11. 12. 13. 14. 15. 2 $164.50 5 $326.25 3 $136.38 4 $18.24 8 $38.48 1. Copy this. Write the missing numbers. Show it to your teacher to be sure you have them all right. 40 20 C. d. e. f. g. h. $2.71 $4.80 $6.75 $5.61 $3.15 $4.32 $9.42 $8.05 30 90 40 80 60 70 0 times any number 6. State the products: 21 21 23 23 43 43 43 625 0X625=0. Write two Os, one under each 0. 175 300 Write the 5 of 15 under the 3. 342 500 200 3. Look carefully at the two ways of doing this example. 142 142 0X142-000, but we need not write the 000. Write as many correct answers as you can in five Solve as many as you can in 10 minutes. 1. The schoolroom has 6 rows, 7 desks in a row, and two extra desks. How many desks has it in all? 2. Miss Adams' class had 37 pupils when school opened. Four new children joined the class. During September, 9 pupils were changed to another class. How many were in the class Oct. 1? 3. Alice is reading a book of 85 pages. She has read 25 pages. How long will it take her to finish it if she reads 10 pages an hour? 4. Will is reading a book of 90 pages. He has read 60 pages. How many pages must he read per hour to finish the book in two hours? *TO THE TEACHER.-In this and similar drills on the following pages, the pupils need not copy the numbers. Have them lay a piece of paper over the page, write answers on it, folding under to write answers for the second row, when necessary. Subtract. Write the differences. See how many you can get correct in five minutes. $10.00 $25.00 $15.00 $12.75 $17.50 $10.00 Solve as many as you can in 15 minutes. 1. Mary is 9, Lucy is 11, Dora is 13. In how many years will Mary be 18? How old will Lucy be then? How old will Dora be? 2. Kate's baby sister is two years and a half old. How many months old is she? 3. Which is longer, a year and a half or 15 months? How much longer? 4. A train leaves Los Angeles at 2:15 P. M. and arrives at San Diego at 6:10 P. M. How long does this train take to go from Los Angeles to San Diego? 5. How far does a train travel in 4 hours at the rate of 32 miles per hour? He 6. Frank walked 12 miles to his uncle's farm. started at 9 A. M. and reached there at 1 P. M. How many miles per hour did he walk? |