82. Dividing by Eight 1. Count by 8's from 8 to 96; from 96 to 8. 2. Answer these questions: 4. Tell how you would divide a pie equally among 4 children; among 8 children. When anything is divided into eight equal parts, we call each part one eighth. It is written 18. Grace will soon be eight years old. She has invited 8 of her girl friends to her birthday party. 1. Tell how many of each of the following things will be needed if the mother furnishes: 3 cakes for each child. 4 sandwiches for each child. 5 pieces of candy for each child. 2 glasses of lemonade for each child. 2. How many candles will be needed for the cake? 3. Grace wants half of the candles pink and the other half white. How many white candles will there be? 4. Grace's mother is 4 times as old as Grace. How old is her mother? 5. Grace's grandmother is 7 times as old as Grace. How old is the grandmother? 84. Square Inches 1. You have been using the inch, the foot, and the yard in measuring length. Today we wish to to measure surface or area. The most convenient measure for small areas is the square inch, or the 1-inch square. 2. Measure each side of this square. it? How wide is it? How long is A square whose sides are each 1 inch long is a square inch (sq. in.). 3. Draw a square inch on the blackboard. 4. Now measure the large square. It is 2inches on a side, or a 2-inch square. Cut a 1-inch square from paper and find how many times it is contained in the large square. 5. Cut a 2-inch square rows are there? How many square inches are in each row? 2X2 square inches are square inches. 6. Cut a 3-inch square. Fold it into square inches. How many rows are there? How many square inches are in each row? 3X3 square inches are square inches. 7. Find the area of a 4-inch square. 8. How many square inches are there in a calendar 8 in. long and 4 in. wide? 9. How many square inches are there in a book page 7 in. long and 5 in. wide? 10. Measure with your ruler and cut or draw: A card 6 in. long and 3 in. wide. A "make-believe" envelope 5 in. long and 4 in. wide. 11. Give the area of each of the drawings you made. 85. Using the Square Inch 1. This is a rectangle. Find rectangles in the schoolroom. 2. Rectangles which are exactly as wide as they are long are called squares. Find squares in the room. 3. How long is the rectangle on page 134? How wide? What is the area of it? 4. Draw a rectangle which is 4 inches long and 2 inches wide. Divide it into square inches. How many long rows are there? How many square inches are in each? 2X4 square inches are square inches. 5. How many short rows are there in your rectangle? How many square inches are in each? 4X2 square inches are square inches. 6. Draw a rectangle 4 inches long and 3 inches wide. Give the area. 7. Give the area in square inches of rectangles having length and width as follows: 1. Draw on the blackboard a square 1 foot long and 1 foot wide. A square whose sides are each 1 foot long is a square foot (sq. ft.). 2. Draw a 2-foot square. Divide it into square feet. How many square feet are in it? 3. Draw a 3-foot square. Divide it into square feet. How many square feet in it? |