HALVES AND FOURTHS 1. Into how many parts is the circle divided? each square? the oblong? CIRCLE SQUARE SQUARE OBLONG 2. How do the parts of the circle compare in size? the parts of each square? of the oblong? 3. One of the two equal parts of anything is one half of it. 4. Draw a line and divide it into halves. What do you do to anything to get one half of it? 5. One half is written; two halves, 2. 6. Divide each half of the circle into two equal parts. Do the same with each square; with the oblong. 7. Into how many equal parts has each object been divided? 8. One of the four equal parts of anything is one fourth, or one quarter, of it. 9. One fourth is written. Write 2 fourths; 3 fourths; fourths. Oral Exercises 1. If six pears are divided into two equal groups, how many pears are there in each group? 2. What part of the pears is in each group? How many pears are pears? of 6 3. How many blocks are there in this row of blocks? 1 4. Into how many equal groups are the blocks divided? What part of the blocks is in each group? How many blocks are of 8 blocks? 5. How many of the blocks are black? white? How many blocks are of 8 blocks? 6. Compare" of 6 pears" with " 6 pears ÷ 2"; "1 of 8 blocks" with "8 blocks 4"; " of 8 blocks" with "8 blocks 2." 7. Observe that "of 6 What does of 8 mean? means the same as 66 6 ÷ 2." of 8? 8. What do you do to anything, or a group of things, or a number, to find of it? of it? 1. This picture represents a foot rule drawn one third of its length. Examine a foot rule and notice the long marks that are numbered. Observe the distance from one of these marks to the next one. It is the same as the length of this line : This length is one inch. 2. Draw a line twelve inches long on the blackboard. This length is one foot. 3. Count the number of inches in the length of a foot rule. How How many inches are there in one foot? 4. Name some things that are measured by the inch; by the foot. How many inches of its length? 6. My sheet of paper is 1 ft. long. wide is it, if its width is of its length? 7. How many inches are there in 3 ft.? in 2 ft. 6 in. ? 1. Measure the length of your desk; the height. 2. Without measuring, draw a line on the blackboard as nearly 1 ft. long as you can. Measure it with a rule. 3. In the same way draw a line ft. long and test your estimate; ft. long; 3 in. long; 2 in. long. 4. Estimate in inches the length, width, and height of a chalk box. Test your estimate by measuring. 5. Estimate and measure the width of a window. 6. Estimate and measure the length and width of a pane of glass in the window of your schoolroom. 7. Estimate how much wider your copy book is than this book. Test by measuring. 8. Is your pad more or less than ft. wide? 1 ft.? how many inches more or less in each case? 9. How many feet long do you think the schoolroom is? how wide? Measure to see. 10. Estimate, in feet, the length of each blackboard in the room. Test your estimate by measuring. |