REVIEW OF SUBTRACTION FACTS 67 54. Review of Subtraction Facts. (ORAL WORK.) We must not forget subtraction while we are learning new things about addition. In Boxes (A) to (H) below is some good practice. Subtract the black number in the center from each number around the outside. Start with the number that the arrow points to and go around to the right. Look at Box (A). The first example is 11-2. The next one is 5-2. In giving the answers, say only the differences, like this: 9, 3, 5. Keep on in this way going around the box until you come to 9-2. (ORAL PRAC 55. Review of Adding by Endings. TICE.) Did you ever count by different numbers? Of course you can count by ones. Try counting by other numbers, also. The three pupils in the picture on the next page are playing the game of "Counting." They are counting by 2's now, beginning with 1. The first pupil says "1," then the next pupil says "3," and the third says "5"; then the first pupil says "7," and so on. The other pupils are watching for mistakes. If a mistake is made, the pupil in his seat who puts his hand up first takes the place of the pupil who made the mistake. Play the counting game below. COUNTING GAME 1. Count by 2's to 41, beginning with 1. 2. Count by 2's to 42, beginning with 2. 3. Count by 3's to 43, beginning with 1. 4. Count by 3's to 44, beginning with 2. 5. Count by 3's to 45, beginning with 3. 6. Count by 4's to 45, beginning with 1. 7. Count by 4's to 46, beginning with 2. 8. Count by 4's to 47, beginning with 3. 9. Count by 4's to 48, beginning with 4. 10. Count by 5's to 46, beginning with 1. 11. Count by 5's to 47, beginning with 2. 12. Count by 5's to 48, beginning with 3. RAPID DRILL-WORK 69 56. Rapid Drill.* (CLASS WORK.) A third-grade child should be able to give the answers to all of the examples below without using a pencil. Can you do it? Study for ten minutes. Be ready to give the answers when your teacher says "Ready." 57. Problems in Addition. (WRITTEN WORK.) The picture below shows you the road from George's house to his grandmother's house. 1. How many turns are there in the road? 2. How many miles is it from George's house to the first turn in the road? 3. How far is it from the first turn in the road to the second turn? 4. How far is it by this road from George's home to his grandmother's home? 5. One day when Jane and Mary were riding, they saw 2 white horses in an orchard, 3 in a pasture, 2 hauling a wagon, and 1 that a boy was riding. How many white horses did they see on their ride? 6. Dorothy and Betty bought some things for their playhouse kitchen. How much did they spend if the potato masher cost 9 cents, the egg beater 9 cents, and the pancake turner 7 cents? REVIEW OF ARITHMETIC WORDS 71 7. Helen visited a store where Indian things were sold. She paid 25 cents for a pair of moccasins for her doll, 10 cents for a little canoe, and 10 cents for a doll papoose. What did all these toys cost? 8. The children in the Wilson School put food on the windowsill for birds. One day they counted 2 sparrows, 3 robins, 2 nut hatches, and 1 blue jay eating the food. How many birds did the children count feeding on the windowsill that day? 9. One morning Harry found some little puppies in the barn. 3 were brown and 5 were black. How many puppies did Harry find in the barn that morning? 58. Review of Words Used in Arithmetic. (SILENT READING.) Read the following questions carefully and be ready to answer them. 1. I am made of silver. I am worth 2 nickels. How many cents am I worth? 2. I am a brown coin. I am not worth as much as a nickel. What is my name? 3. I am a coin bigger than a dime, but I cannot buy so much as a dime, because I am not silver. I am not as large as a nickel. What is my name? 4. I am a larger coin than a nickel. I can buy more than a dime. What is my name? 5. I am made of two little lines. When you see me between two numbers, you add the numbers. Can you name me? |