SUBTRACTION. Units of minuend smaller than units of subtrahend. (Review page 74.) 81 NOTE. - Do not use the word borrow. We do not borrow what we have no intention of returning; we simply take it. Have the pupils perform the subtraction with splints before attempting to put the work on paper. Give the pupil 2 tens and 3 units. He will readily see that in order to take away 1 ten and 7 units he must resolve one ten into units. He will then have 1 ten and 13 units. From this he can readily take one ten and 7 units. 1 13 23 17 Explain clearly that we take 1 ten from the 2 tens, which of course equals 10 units. This added to 3 units makes 13 units. 7 units from 13 units leaves 6 units. 1 ten from 1 ten leaves nothing. 6 1. NOTE. The teacher should have 10 bundles of splints, each bundle containing 10 splints. 1. Ten tens make one hundred. 2. Write 9 tens and 4 units. 3. Write ten tens and 2 units. 4. Write 1 hundred, 2 'tens, and 3 units. 5. Read 146, 116, 127, 136, 185. 6. Read 205, 302, 317, 460, 509. 8. Write 3 hundreds, 4 tens, 6 units. 9. Write 5 hundreds, no tens, 2 units. 10. Write two hundred five. 11. Write four hundred sixty-five. 17. How many tens are there in 100? Be sure at this point that the pupils know the multiplication and division facts through the table of fives. 1. In 3 bu. there are 12 pecks. How many pecks are there in 1 bushel? 2. When 5 oranges cost 20 cents, what is the price of 1 orange? 3. In 4 weeks there are 28 days. How many days are there in a week? 4. If a horse travels 21 miles in 3 hours, how many miles does he travel in an hour? 5. If there are 60 trees in 5 rows, how many trees are there in each row? 6. If 4 pencils cost 16 cents, what is the price of 1 pencil? 7. I bought 5 blank-books for 50 cents. the price of 1 book? 8. There are 36 quarts of oil in a barrel. gallons are there? What was How many 9. When 4 barrels of flour cost $24, what is the cost of 1 barrel? 10. There are 60 inches in 5 feet. How many inches are there in 1 foot? 11. When 5 tons of coal cost $30, what is the price of 1 ton? What is the price of half a ton? 12. When a pound of dates cost 20 cents, how much ought I to pay for a quarter of a pound? 13. If a man earns $3 a day, how many days must he work to earn $27? 14. When 5 quarts of milk cost 35 cents, what is the price of a quart? 15. When 4 yards of ribbon cost 32 cents, what is the price of a yard? What is the price of of a yard? Of of a yard? 41. 42. 43. 44. 45. 46. 47. 48. 49. 50. 51. 7+ 8+ 9 + 4 + 6 + 8 + 5 + 7 + 4 + 3 = ? 9+7+7+6+8+9+7+6+ 8+ 9 = ? 52. 53. 8+7 +6 + 5 + 4 + 3+2+1+0 54. 987 +6 +5 +4+3+2+ 7=? 0=? = 55. 469 + 7+ 8+ 9 + 6 + 5 + 8 + 7 = ? 56. 654+7+9+8+7+8+5 ? 57. 7+ 8+ 9 +6+4+9+8+7 +6 + 5 5? 58. 84+7+3+2+1+7+5 7 +5 +9 +8 B = ? 59. 67+8+8+7+7+9+4+7+6= ? 1. Into how many equal parts is each of these figures divided? 2. What is each part called? 3. Draw a line 8 inches long; mark off of it. 5. Draw a rectangle 8 inches long and 1 inch wide; divide it into square inches. Mark off of it. 6. Draw a rectangle that is 4 inches long and 2 inches wide; divide it into square inches, and mark off of it. 7. What part of 8 squares is 1 square? 8. What part of 8 inches is 1 inch? 9. What part of 8 apples is 1 apple? 10. What is of 8? of 8? g of 8? 11. How many eighths are 8-4? 12. How many eighths are in of an apple? 13. 3 is of what number? 14. of 16 and of 16 are how many? 15. 2 is of what number? 16. Among how many children can you divide an orange if you give each child of it? 00:00+0000000000000000000000000 282820200 0000000000000000 10006878200 || || || || 2.2.2. 1818182/00 284082878 || || || || a. a. 2. a. 00/0000/00 +0000/00 || || || || || || || 100000+/0000/00 2.2.2.2. 10101100100 00/0000/0000/0000/00 ? |