11. At Christmas, Horace received 9 gifts from his parents, and 4 from other friends. How many gifts did he receive? 12. A certain house has 5 windows in one side and 7 in another. How many windows in the two sides? 13. How many are 5 oranges and 4 oranges? 6. boys and 3 boys? 5 horses and 6 cents? 14. Why can you not tell how many 5 horses and 6 cents are? 15. Why can you tell how many 5 oranges and 4 or anges are? Numbers that express things of the same name are called Like Numbers. 16. What kind of numbers only can be united ? DEFINITIONS. 44. Addition is the process of finding a number which shall be equal to two or more given numbers. 45. The Sum or Amount is the result obtained by adding. 46. The Sign of Addition is an upright cross: t. It is called plus, and is placed between numbers to be added. Thus, 3 +4 is read 3 plus 4, and means that 3 and 4 are to be added. 47. The Sign of Equality is two short horizontal lines: =. It is read equals, or is equal to. Thus, 3+4=7, is read 3 plus 4 equals 7. The expression 3+4=7, or any other expression of equality, is called an Equation. 48. PRINCIPLES.—1. Only like numbers can be added. TABLE. 1+1= 211+2= 311+3= 41+4= 5/1+ 5= 6 2+1= 32+2= 42+3= 52+4= 62+ 5= 7 3+1= 4 37-2= 5 3+3= 63+4= 73+5= 8 4+1= 5 4+2= 6 4+3= 7 4+4= 8 4+ 5= 9 5+1= 65+2= 75+3= 8 5+4= 95+ 5=10 6+1= 7 6+2= 86-3= 9 6+4=10 6+5=11 7+1= 87+2= 9 7+3=10 7+4=117+ 5=12 8+1= 9 8+2=108+3=118+4=128 + 5=13 9+1=10 9+2=119+3=129+4=139+ 5=14 1+6= 711+7= 811+8= 1+8= 91-+9=101+10=11 2+6= 82+7= 92+8=10 2+9=11 2+10=12 3+6= 9 3+7=103 +8=113+9=12 3+10=13 4+6=10 4+7=11 4+8=12 4+9=13 4+10=-14 5+6=11 5+7=12 5+8=13 5+9=14 5+10=15 6+6=12 6+7=13 6+8=14 6+9=15 6+10=16 7+6=13 7+7=14 7+8=15 7+9=16 7+10=17 8+6=148+7=158+8=16 8+9=178+10=18 9+6=15 9+7=169+8=179+9=189+10=19 CASE I. 49. To add single columns. 1. A grocer sold 8 pounds of sugar to one man and 7 pounds to another. How many pounds did he sell to both ? ANALYSIS.—Since he sold 8 pounds to one man and 7 pounds to another, to both he sold the sum of 8 pounds and 7 pounds, which is 15 pounds. 2. A man rode 7 miles the first hour and 6 miles the second hour. How far did he ride in the two hours? 3. On one tree are 8 birds, and on another 4 birds. How many birds are there on both ? 4. Carl earned $2 in May, $5 in June, and $4 in July. How much did he earn in the three months? 5. I gave 6 nuts to one boy, 5 to another, and 3 to another. How many nuts did I give to all? 6. I paid 5 cents for paper, 3 cents for pens, and 5 cents for ink. How much did I pay for all? 7. A lemon cost 5 cents, an orange 6 cents, and a pineapple 8 cents. What did they all cost? 8. Esther gave her teacher 5 pinks, 7 roses, and 4 pansies. How many flowers did she give her? 9. James shot 9 birds, Henry shot 6, and William 5. How many did they all shoot? 10. A woman picked 9 quarts of blackberries one morning, while her son picked 3 quarts. How many quarts did both pick? 11. James solved 6 examples, John 5, William 8, and Henry 7. How many examples did they solve in all ? 12. One boy picked 6 quarts of cherries, another 4 quarts, another 5 quarts. How many quarts did they all pick? 13. I gathered from one pear-tree, this year, 2 bushels of fruit, from another 4 bushels, from another 3 bushels, and from another 2 bushels. How many bushels did I gather from these four trees? 14. A merchant sold from a piece of cloth, 3 yards at one time, 6 yards at another, 8 yards at another, and 5 yards at another. How many yards did he sell in all? 15. A man picked 8 barrels of apples on Monday, 6 barrels on Tuesday, 4 barrels on Wednesday, and 5 barrels on Thursday. How many did he pick altogether? 16. Henry learned 7 verses of poetry on one day, 5 on another, 6 on another, and 8 on another. How many verses did he learn in the four days? 17. A man paid $9 for a coat, $4 for pants, and $2 for a hat. How much did he pay for all ? 18. In a garden there are 8 apple-trees, 7 plum-trees, and 9 peach-trees. How many trees are there in the garden? 19. There are 4 boys and 7 girls in one class, and 6 boys and 8 girls in another. How many pupils in both classes ? 20. Homer paid 8 dollars for a fur cap, and 5 dollars for a pair of skates. How much did both cost him? 21. A boy gathered nuts for three days. The first day he brought home 8 quarts, the next day 7 quarts, the next day 9 quarts. How many quarts did he bring home? 22. Repeat the addition table of ones. Of twos. Of threes. Of fours. Of fives. Of sixes. Of sevens. Of eights. Of nines. Of tens. . 23. Count by 2’s from 0 to 20; thus: 0, 2, 4, 6, 8, 10, 12, etc. 24. Count by 3's from 2 to 26. From 26 to 41. 25. Count by 4's from 0 to 36. From 5 to 53. 26. Count by 5's from 3 to 43. From 7 to 72. 27. Count by 6's from 0 to 42. From 4 to 46. 28. Count by 7's from 4 to 39. From 11 to 60. 29. Count by 8's from 2 to 58. From 7 to 63. 30. Count by 9's from 7 to 70. From 8 to 71, WRITTEN EXERCISES. PROCESS. 50. 1. What is the sum of 5, 4, 7, and 6 ? ANALYSIS.—We write the numbers to be added in a 5 column, and begin at the bottom to add; thus: 6, 13, 17, 4 22; and write the sum beneath. To prove the work we 7 may begin at the top and add downwards. If the result 6 agrees with the one formerly obtained the work is proba bly correct. In adding say, 6, 13, 17, etc., instead of 6 22 Sum. and 7 are 13 and 4 are 17, etc. 51. Required the sum of the following: 14. 6, 7, 5, 3, 2, 4, and 5. 20. 7, 8, 8, 9, 0, 3, and 3. 15. 8, 2, 0, 3, 3, 2, and 4. 21. 8, 9, 7, 8, 5, 8, and 2. 16. 5, 6, 7, 6, 4, 2, and 8. 22. 7, 6, 5, 4, 3, 2, and 1. 17. 3, 2, 6, 5, 8, 7, and 9. 23. 5, 4, 4, 3, 2, 6, and 7. 18. 8, 3, 0, 5, 3, 8, and 2. 24. 4, 3, 4, 5, 6, 8, and 8. 19. 7, 6, 6, 4, 3, 6, and 3. 25. 3, 6, 8, 6, 7, 0, and 5. 26. There are 8 chickens in one coop, 9 in another, 7 in another, and 5 in another. How many chickens are there in all the coops? 27. My father has 5 horses, 9 cows, 7 sheep, and 3 pigs. How many animals has he in all ? 28. A man walked from A to B in four hours. He went 4 miles the first hour, 3 miles the second hour, 5 miles the third hour, and 6 miles the fourth hour. · What was the distance between the two places ? 29. A house had 8 windows on the east side, 7 on the west, and 9 on the south. How many were there in all? |