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163. 1. Add a column of six 3's; of nine 2's. 2. Two 9's are ;

nine 2's are 3. Find the sum of three 7's; of seven 3's. 4. In 3 weeks there are days.

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

Give the products in the above exercises from right to left.

Give the products from right to left, adding 3, 4, and 5 to each product, thus, adding 3: 21, 24; 18, 21; etc.

Give the products from right to left, adding 6, 7, and 8 to each product, thus, adding 6: 21, 27; 18, 24; etc.

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167. 1. Memorize the following:
6
9
7
3
2

3 3)18 2)18 3)21 6)18 9)18 7)21

2. A boy had 18 marbles and sold į of them. How many marbles did he sell? How many marbles did he have left ?

3. How many weeks are there in 21 days?
4. A girl had 18 cents. She spent of her money

4 for some paper. What was the cost of the paper ? How much money had she left ?

5. If 18 apples are divided equally among six boys, what part of the whole number of apples will each boy receive ?

6. If 18 pencils are divided into 2 equal groups, how many pencils will there be in each group?

7. What part of 18 inches are 6 inches?
8. What is the ratio of 21 to 7? Of 7 to 21 ?

9. In finding the number of $3 there are in $ 21, the unit of measure is –, and the quantity measured is

What part of 18. feet are 2 feet ? Are 9 feet? 11. What is the ratio of 2 feet to 18 feet? 12. Find 1 of $ 21. Find { of $18.

13. How many 2-cent stamps can be bought for 18 cents ?

10.

168. Study Exercises. 3)18 2,18 3)21 6)18 918 7)21 3)19 2)19 3)22 6)19 9)19 7)22 3)20 2,17 3)23 6)13 5)16 7)23 3,16 3)17 8)17

4)17 7)15

7)16 In the study of the above exercises use the following models:

(a) In 19 there are six 3's and 1 remainder. (6) One third of 19 is 61.

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

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1. 2)1980 2. 2)1816 3. 3)1005 4. 3)2001 5. 4)1768 6. 5)1160 7. 6)1812 8. 7)2331 9. 8)1776 10. 9)1809

2)1330 2)1412 3)1215 3)1710 4)1372 5)1615 6)1998 7)1631 8)9768 9)1998

2)9398 2)5112 2)1776 2)1306 2,3170 2)1360 3)1998 3)1665 3)2322 3)1671 3)1356 355109 4)1736 4)1216 4)9736 5)1510 5)1155 5)1665 6)1332 6)7206 6)7938 7)9184 7)1561 7)7140 8)1608 8)1760 8)1696 9)1098 9,1089 951908

) )

170. Oral Problems. *

1. At $2 each, how many chairs can be bought for $8?

MODEL for oral recitation : Since 1 chair costs $2, as many chairs can be bought for $8 as there are $ 2 in $8, or 4. Four chairs can be bought for $8. MODEL for written recitation :

4 chairs for $8. cost of 1 chair, $2$8 2. If 1 pair of shoes costs $3, how many pairs can be bought for $12?

3. If 1 box of berries costs 5$, how many boxes can be bought for 20¢?

4. At $3 each, how many hats can be bought for

$9?

5. How many yards of ribbon at 4¢ a yard can be bought for 16¢?

6. At 6¢ each, how many tablets can be bought for 18¢?

7. If a boy earns $4 a week, in how many weeks will he earn $ 20 ?

8. A farmer sold some sheep for $6 each. He received $ 18. How many sheep did he sell ?

9. If 2 girls sit in each seat, how many seats will 20 girls occupy?

10. A girl earns 8¢ a day. In how many days will she earn 16¢?

* See note, p. 115.

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