36

34

43. Tests for the Accuracy of the Result.

1. Add in the opposite direction. Why is this a test? 2. Add from the left-hand order.

ILLUSTRATION: Take the example in the margin. The 27 sum of the tens is eight, but to justify the 9 written in the answer one ten must have come from the units; adding the units we have the needed ten, and the seven units written in the answer.

97

ORAL EXERCISES.

44. 1. In Lucy's class are 8 boys and 9 girls. How many children are there in the class?

2. George bought for his mother 6 cents' worth of matches and 12 cents' worth of soap. How many cents did he pay for both?

3. There were 11 mowers in the field, and 8 boys turned the grass. How many persons were working in

the field?

4. Mr. Osgood paid his grocer $8 for a barrel of flour, and enough for a half-barrel of sugar to make the cost of both flour and sugar $20. How many dollars did he pay for the sugar?

5. A farmer sold 14 bushels of new potatoes to one dealer and 6 bushels to another. How many bushels. did he sell to both?

6. How many trees are there in an orchard which has 23 apple trees and 7 peach trees?

7. If Laura sells 9 chickens to one man and 18 to another, how many chickens does she sell?

8. Of daily papers a newsboy sold 27 morning papers and 9 evening papers. How many papers did he sell

all together?

9. Frank broke a window in Mr. Lovett's shop, and had to pay 24 cents for a glass and 8 cents to get it put in place. How much did he have to pay for his carelessness?

10. One express package weighed 20 pounds and another weighed 15 pounds. How many pounds did both weigh?

11. Mr. Jones has 13 Jersey cows and 14 Durham How many cows has he?

COWS.

12. A lady paid $26 for a dress, $8 for a bonnet, and $5 for an umbrella. How many dollars did she pay for all?

13. One piece of ice weighs 34 pounds and a smaller piece weighs 12 pounds. How many pounds do both pieces weigh?

14. A merchant sold 19 yards of muslin to one customer, 9 yards to another, and 10 yards to another. How many yards did he sell to all three customers?

15. Mr. Adam paid a stock-dealer $46 for a Holstein cow and $9 for her calf. How many dollars did he pay for both?

16. If I pay 40 cents for a tie and 15 cents for a collar, how many cents do I pay for both?

He paid $6 to

17. Harold paid $26 for a desk. have it painted, and sold it for $7 more than it cost him. How much did he get for it?

18. A farmer raised 14 loads of hay in one field, 12 loads in another, and 8 loads in another. How many loads of hay did he raise?

19. A lady has 13 hens and 20 ducks. How many fowls has she?

20. A grocer sold 23 pounds of sugar to one customer, 13 pounds to another, and 8 pounds to a third. How many pounds did he sell to all three?

21. One monument is 17 feet high, a second is 8 feet higher than the first, and a third is 9 feet higher than the second. How high is the third?

22.

A girl has read 25 pages in a primer and 40 pages in a first reader. How many pages has she read?

23. Mary has a 25-cent piece, a 10-cent piece, and a 2-cent piece. How many cents has she?

24. There are 24 cherries on one branch and 30 on another. How many cherries are there on both branches?

25. A boy selling newspapers, made 23 cents on Monday and 21 cents on Tuesday. How many cents. did he make on both days?

26. One family used 28 quarts of milk in a week, and another used 22 quarts. How many quarts did both families use in a week?

27. Harry has earned 30 cents selling papers. How many more cents must he earn to have 50 cents?

28. A farmer sold three loads of potatoes. The first contained 25 bushels, the second 25 bushels, and the third 20 bushels. How many bushels did he sell?

29. From a peddler I bought a bushel of tomatoes for 70 cents, a half-bushel of turnips for 20 cents, and a half-peck of peas for 10 cents. How many cents did I pay for all?

30. After spending 55 cents for a book, Albert found he had 20 cents left. How many cents had he at first?

31. There are 25 ducks in one pond and 24 in another pond. How many ducks in both ponds?

32. There are 30 boys in the first class in geography and 42 in the second class. How many boys are there in both geography classes?

33. A farmer took 40 and 24 eggs on Tuesday. both days?

eggs to market on Monday How many eggs did he take

34. A farmer has 40 acres of corn planted in one field and 36 acres in another field. How many acres of corn has he all together?

35. Carl earned 44 cents in one day and 56 cents the next day. How many cents did he earn in both days?

WRITTEN EXERCISES.

45. 36. Find the sum of eight hundred ninety-six, five thousand six hundred seven, fifty-nine, seven thousand four hundred twelve, nine hundred sixty-eight.

37. Find the sum of thirty-six thousand seven hundred eight, eight thousand ninety-four, twenty-seven thousand six hundred eight, six hundred four thousand five hundred eighty, fifty-five thousand four hundred nineteen.

38. Find the sum of eight hundred twenty-six thousand seven hundred fifteen, eight thousand ninety-six, forty-nine thousand eight hundred seven, four million nine hundred thousand six hundred, seventeen million sixty-eight thousand forty-six.

39. Find the sum of nine million six hundred thirtyseven thousand four hundred eighty-five, forty-six million eight hundred five thousand six hundred nineteen, eighty-four million eight hundred eighty-six, nine hundred thirteen million ninety-eight thousand nine hundred, seven hundred seven million four hundred ten thousand eight hundred eleven.

40. Find the sum of eight hundred seven million four hundred six thousand nine hundred five, five hundred eighty-two million seven hundred fifty-eight, six hundred million seven hundred ninety-five thousand, fourteen billion eighty-seven million nineteen thousand six hundred eighty, seventy-five billion four hundred eighty-six.

The first weighed

41. A farmer sold five fat oxen. 1,397 pounds; the second, 1,578 pounds; the third, 1,272 pounds; the fourth, 1,485 pounds; and the fifth, 1,508 pounds. What was the weight of all five together?

42. An orchard contains 135 cherry trees, 119 more pear trees than cherry trees, as many apple trees as there are pear trees and cherry trees, and 146 more plum trees than pear trees. How many trees are there

in the orchard?

43. Mr. Brown, in his will, gave each of his three daughters $3,475, to each of his two sons $4,865, and to his wife as much as to his two sons and one daughter. What was the value of his property?