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 64, 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 clotlı costs 12€, what is the cost of

1 yd. ?

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

11. What is the cost of yd. of cloth at 15¢ a yard ? 12. What is the cost of 1 doz. eggs at 12¢ a dozen ? 13. If 4 chairs cost $12, what is the cost of 1 chair ?

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 —; cight 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 ? 9. Memorize : : 4. 8 7 2

2 x 2

x 8

x 7
16
16
14
16

14

X4

x2

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 ?

153. Study Exercises. 4

8 x4

x 2

2

7 x 2

2 x 7

x 8

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.

4. Multiply 457 by 20. MODEL: 457 0 times 457 is 0. Write. O under

x 20 the 0 in the multiplier. 2 times 9140 7 is 14. Write the 4 under the 2

in the multiplier, and continue. b d

f

g 5. 3457

a

с

e

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

156. 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 In 7 there are three 2's and 1

2)70. remainder. Write 3 above the 7,

and think the 1 before 0. In 10 there are 5 twos. Write 5 above the 0. There are 35 twos in 70. One half of 70 is

a

с

d

e

1. 2570

157. Divide :

b
2)50 2)92 2576

) 2)34 2. 3)102 3105 3)300 3)420 3720

)) 3. 2)530 2)302 2.710 2930 3)1032

)

f 3)42 3)672. 357032.

а

158. 1. In $4 there are 1

$2. In $5 there are - $2 and $ remainder.

2. What is 1 of 5? What is 1 of 11? 3. To find one half of a number, divide it by — 4. Find 1 of 9. MODEL: 41 There are four 2's in 9, and

2)9. 1 remainder. The remainder is

written over the divisor as above. 5. One half of 9 is — Nine divided by 2 is — 6. Find 1 of 7; of 11; of 13; of 5; of 10. 7. Find of 4; of 7; of 10; of 5; of 8. 8. Find 4 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, or

و

:

159. Read and memorize:
4.
2
2
7

8 4)16 8)16 7)14

2)14

2516 160. Supply quotients in the following: 1. 6; 2= x. 7. 10:2=x. 13. 15:3=x. 2. 8+4=x. 8. 12:6=x. 14. 12+2=x. 3. 6+3=x. 9. 15+5=x. 15. 14+2=x. 4. 9_3=x. 10. 16:2=x. 16. 16+8=x. 5. 8:2 = x. 11. 12:3=X. 17. 14+ 7 = x.

: 6. 4+2=x. 12. 16:4=X. 18. 12+4=3.

:X

=