171. Written Problems. 1. A man bought 4 cows. For one he paid $ 27, for another $32, for another $ 36, for another $ 40. How much did he pay for the four cows ? 2. At $32 each, what will be the cost of 4 cows ? 3. Can you find the cost of the cows in the first problem by multiplication ? 4. Can you find the cost of the cows in the second problem by addition ? 5. When can you use either addition or multiplication to find the cost of cows ? 6. When you can use either addition or multiplication, which is the better to use? Why? 7. A man bought a farm for $3675, and sold it for $5000. Did he gain or lose, and how many dollars ? 8. A man bought 6 sheep at $3 each and sold them for $25. Did he gain or lose, and how much ? 9. A farmer owned 1860 acres of land. He divided his land into 3 farms, with the same number of acres in each. How many acres were there in each of the farms ? 10. At $4 each, how many sheep can be bought for $ 128 ? 11. At $5 each, how many barrels of flour can be bought for $65 ? 12. At 23¢ a yard, what will be the cost of 6 yards of cloth ? 172. Oral Problems. 1. How many halves are there in 1 apple? In 1 circle? In 1 dollar? In 1 day? 2. How many halves are there in 2 apples ? In 2, apples? In 3 apples? In 31 apples ? In 42 days ? 3. How many apples must be cut into halves in order to get apples ? g apples? g apples ? 4. Tell how many whole apples each of the following is equal to : apples, z apples, į apples. 5. A man paid 4 boys į dollar each for helping him on a Saturday. How many dollars did he pay them all ? 6. There were 8 children at a party. A lady gave one half of an orange to each. How many oranges did she give to all ? 7. 24 apples = apples; apples - apples; 31 apples = apples. 8. 41 days = days; 5.1 dollars = , dollars. 3 . 9. 61 feet = feet; 12 inches = inches. 10. apples apples; } oranges - oranges. 11. Tell how many half apples each of the following is equal to: 2 apples, 2.1 , apples, 4 apples, 41 apples, 51 apples, 31 apples, 6 apples. , 12. Seven half dollars are equal to how many dollars ? 13. A girl spent 5 half days in the city. How much more than 2 days did she spend there? 1 173. Drill Exercises. 6. 6 x 2 is read, 6 multiplied by 2. It is the saine as x2 Supply products for x, and add to each product the number above the column as in a : 12, 14; 16, 18. Give answers only: (2) (3) (5) (7) b d 1.6x2=12, 14 8x2=16, 19 7x3 = 3 x 2 = x х 2. 4x4=16, 18 4 x 3 = x 2 x 5 x 5 x 3= x = = 3. 5x2=X 6 x 3=3 4 x2=x 3 x 4= x 4. 3 x 3=x 7 X 2= 3 x 5 = x 2 x 6= x 5. 2 x 3=x 3 x 6=x 9 X 2=X 2x 8 = x x x 2.x8X a с = a с 174. Drill Exercises. b 18:6=x 18.9=2 3. 21+3= x X 16:8=x 15+3=2 d 193= 11:2=2 13:6='c a e m 7 6 176. Oral Exercises. h i j E 1 3 9 8 7 6 6 1 7 6 9 9 5 3 2 4. 1 3 9 3 4 1 3 5 5 7 8 6 9 7 8 7 1 4 6 7 7 5 9 3 8 4. 2 3 9 6 4 4. 5 3 2 4 1 5 8 6 8 7 8 6 5 7 8 6 9 5 4 4 2 3 2 8 4 8 9 7 8 9 8 2 2 7 9 8 6 7 8 9 6 5 8 9 8 6 9 CO los Name five combinations whose sums are ten. When these combinations occur in a column, they may be taken together. Exercise a above may be added : 12, 22, 29, 39, 42. Add the above exercises in a similar manner. 178. Oral Exercises. 1st BK IRITU-9 Study the above exercises until you can give the products without hesitation. Give the products, from right to left; adding 4 to each product; adding 6 to each product. 180. Multiply 3457 by 23. MODEL: 3457 Multiply 3457 first by 3, and 23 write the product. Next, multiply 10371 by 2. Two 7's are 14. Write the 6914 4 under the 2. After completing 79511 the multiplication by 2, draw a line and add the products. 19. 3223 x 89 х 181. Written Exercises. 13. 2050 x 54 5. 8975 x 23 14. 3524 x 54 6. 3240 x 35 15. 2320 x 67 Х 7. 6978 x 32 16. 3023 x 67 8. 4036 x 23 17. 1323 x 67 9. 9380 x 32 18. 2032 x 67 22. 3020 x 98 23. 3123 x 84 24. 2323 x 29 25. 4534 x 15 26. 3750 x 13 27. 4567 x 20 |