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38. Write in columns and add:

1. 43768, 89765, 876432, 876, 8964, 4325,

4536, 43206, 4325.

2. $10.50, $165.28, $170.18, $650.24, $130.50, $750.20, $45.85.

3. 2345.78, 786.005, 879.652, .0785, 61.875, 64.025, .00875.

4. 6789, 5432, 79865, 67485, 96874, 897645, 87453, 87642, 3456.

5. $67.45, $750.18, $6.45, $850.75, $87, $120.15, $2.50, $.75.

6. 432.5, 678.008, 76.075, 68.0125, 600.008, 705.075, 76.0005.

7. $150.25, $45.76, $432.45, $78.15, $130.20, $200, $150.36, $105.05.

Special Drills to strengthen Addition

39. If you have trouble in adding rapidly and accurately, you will find the following drills helpful:

1. Learn these tables thoroughly:

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If

you add these combinations both up and down, you have all of the combinations that will be likely to trouble you.

2. Then practice adding where you change the figure in tens' place, using the larger number first, as this is the form in which the combination will come to you in adding columns.

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3. If you are very weak in addition and add very slowly, practice with a complete table in series with the combinations which trouble you. For example, if you find the addition of 8 troubles you, make a series table with 8, where you change

the tens,

8 8 8 8 8 8 8 8 8 8 8 8 15 25 35 45 55 65 75 85 95 105 115 125

If the combinations of 6's and 7's trouble you, make a table like this:

6 7 6 7 6 7 6 7 6 7 7 16 17 26 27 36 37 46 47 56

It is much better to find your trouble, and conquer it, than to continue general practice, hoping to overcome it in that way.

Practice adding as rapidly as possible. You will make more mistakes when you add slowly than when you add rapidly.

Business men place great importance upon the ability to add long columns of figures rapidly and accurately, so you may well study your personal need very carefully, and strive to overcome it by carefully selected drill exercises.

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40. 1. How many acres in three fields contain

ing 23 acres, 34 acres, and 38 acres?

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2. A man bought a carriage for $135, a horse for $250, a whip for $1.75, and a robe for $12.75. What did they all cost?

How

3. A man owns three lots of the following sizes: 6.75 acres, 3.125 acres, 8.675 acres. many acres are there in all?

4. Mr. Jones bought a farm for $3785. After spending $2900 for new buildings, he sold it at a gain of $750. For how much did he sell the farm?

5. The area of the United States is 3,602,990 square miles; of the Philippine Islands, 143,000 square miles; of Porto Rico, 3600 square miles; of Hawaii, 6740 square miles. What is the total

area?

6. New York is 1405 miles east of Omaha by railroad, and San Francisco is 1864 miles west of Omaha by railroad. How far is it from New York to San Francisco by this route?

7. How many yards are there in three pieces of cloth, the first containing 18.375 yards, the second 41.625 yards, and the third 35.5 yards?

8. Find the amount to be paid for the following: tie, 50; gloves, $1.25; shirts, $2.50; umbrella, $3.50; rubbers, $.75; collars, 50%.

9. In a city school there are 250 pupils in the first year, 275 in the second year, 234 in the third year, 194 in the fourth year, 187 in the fifth

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