151. Oral Problems.*

1. If 2 chairs cost $6, what is the cost of 1 chair? MODEL for oral recitation: If 2 chairs cost $6, 1 chair will cost one half of $6, or $3. MODEL for written recitation:

$3, cost of 1 chair.

2)$6, cost of 2 chairs.

2. If 2 stoves cost $10, what is the cost of 1 stove? 3. If 2 tables cost $8, what is the cost of 1 table? 4. If 2 tablets cost 124, what is the cost of 1 tablet? 5. If 3 boxes of berries cost 15, what is the cost of 1 box?

6. If 3 pencils cost 6, what is the cost of 1 pencil? 7. If 3 hats cost $9, what is the cost of 1 hat? 8. If 4 pairs of shoes cost $12, what is the cost of 1 pair?

9. If 1 yd. of cloth costs 12%, what is the cost of yd.?

10. If 1 yd. of ribbon costs 8, what is the cost of yard?

11. What is the cost of 12. What is the cost of

yd. of cloth at 15a a yard ?

doz. eggs at 124 a dozen?

13. If 4 chairs cost $12, what is the cost of 1 chair? 14. What is the cost of 1 stove at the rate of 2 stoves for $12 ?

* See note, p. 115.

152. Oral Exercises.

1. Add a column of four 4's; of five 3's.

2. Count by 4's to 16; by 3's to 15.

3. Add a column of seven 2's; of eight 2's.

4. Count by 2's to 14; by 2's to 16.

5. Four 4's are five 3's are

-;

;

three 5's are

6. Seven 2's are; two 7's are; eight 2's are —. 7. In 16 there are 4's. There are 2's in 16. 8. How many nickels are there in 15 cents?

10.

7 is read two 7's are 14. It may also be x 2 read, two times 7 is 14.

11. A boy bought 3 oranges at 5 each. How much did he pay for all?

12. At 3¢ each, how much will 5 pencils cost?

13. Frank has $4 and Arthur has four times as much money. How much money has Arthur?

14. At $2 each, how much will 8 hats cost?

15. There are 7 days in one week. How many days are there in 2 weeks?

16. Ethel worked 8 problems and Edna worked twice as many. How many problems did Edna work?

Study the above exercises until you can give the products without hesitation.

Give the products from right to left, adding 3 to each product, thus: 14, 17; 16, 19; etc.

155. Oral Exercises.

Add each column as indicated in Step C, p. 49.

156.

7 6 9

1. Show by objects how many 2 books there are in 3 books; in 5 books; in 7 books.

2. Show how many 3 boys there are in 7 boys.
3. In 7 there are 2's and remainder.
4. How many 2's are there in 70?

MODEL: 35 2)70.

there are 5 twos.

In 7 there are three 2's and 1 remainder. Write 3 above the 7, and think the 1 before 0. In 10 Write 5 above the 0. There are One half of 70 is

35 twos in 70.

157. Divide:

α

3. 2)530 2)302 2)710 2)930 3)1032 3)7032.

158. 1. In $4 there are $2. In $5 there are

- $2 and $

2. What is

remainder.

of 5?

of 5? What is
What is of 11?

3. To find one half of a number, divide it by

MODEL:

41

There are four 2's in 9, and 2)9. 1 remainder. The remainder is written over the divisor as above.

Nine divided by 2 is

5. One half of 9 is -.

of 13; of 5; of 10.

6. Find of 7; of 11;

7.

Find

of 4; of 7; of 10; of 5; of 8.

8. Find of 5; of 6; of 7; of 8; of 9; of 10.

9. Six divided by 2 may be written : 2)6, or 6 ÷ 2,