MULTIPLICATION. 37
10. If one pound of raisins cost 6 cents, what will 4 pounds cost? 5 pounds? 6 pounds? 7 pounds? 8 pounds? 9 pounds? 10 pounds? 12 pounds?
11. In one acre there are four roods; how many roods in 2 acres ? in 3 acres ? in 4 acres? in 5 acres? in 6 acres ? in 9 acres?
12. A good pair of boots is worth 5 dollars; what must I give for 5 pairs? for 6 pairs? for 7 pairs? for 8 pairs? for 9 pairs?
13. Acord of good walnut wood may be obtained for 8 dollars; what must I give for 4 cords? for 6 cords? for 9 cords?
14. What is the cost of 4 quarts of milk at 5 cents a quart, and 8 gallons of vinegar at 10 cents a gallon?
15. If a man earn 7 dollars a week, how much will he earn in 3 weeks ? in 4 weeks? in 5 weeks? in 6 weeks? in 7 weeks? in 9 weeks?
16. If i thousand feet of boards cost 12 dollars, what is the cost of 4 thousand? 5 thousand ? 6 thousand? 7 thousand ? 9 thousand ? 12 thousand?
17. If 3 pairs of shoes buy one pair of boots, how many pairs of shoes will it take to buy 7 pairs of boots?
18. If 5 bushels of apples buy 1 barrel of flour, how many bushels of apples are equal in value to 12 barrels of flour?
19. If one yard of canvas cost 25 cents, what will 12 yards cost?
Illustration.—25 is composed of 2 tens and 5 units; 12 times 2 tens are 24 tens, and 12 times 5 units are 60 units, or 6 tens; 24 tens added to 6 tens make 30 tens, or 300. Therefore, 12 yards will cost 300 cents.
20. In one pound (English money,) there are 20 shillings; how many shillings in 3 pounds ? in 4 pounds! in 6 pounds?
