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MATH DEVELOPMENT ALBUM
6.7 DOT GAME
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MATERIALS:
1. Problem cards.
2. A ground class board 14 1/2 inches long and 10 V2 inches high mounted in a natural wood frame. The board is divided into six equal vertical columns. The column on the right is blank. The other five columns are divided into squares, 10 across and 25 down. The columns are numbered at the top. The first one on the right has a green 1, the second a blue 10, the third a red 100, the fourth a green 1000 and the fifth a blue 10,000. At the base of each of these columns are two blank spaces.
3. Pencils- lead, green, blue and red.
4. Eraser.
PREPARATION:
1. Invite the child who has worked with addition with the decimal system and the stamp game. The child should have worked with dynamic addition.
2. Obtain the materials and take them to the table. Bring prepared problem cards.
PRESENTATION I: (ADDITION)
1. Copy the problem in color on the blank side of the board. Example:
2. Start with the units in the right column under the green 1.
3. With the lead pencil make 6 slash or dot marks, one in each square.
4. Then make another 7 marks as the problem card indicates.
5. When the number of marks reaches 10, go down to the next row and mark three more spaces.
6. Tell the child that when you have finished with all the unit marks you go the tens column.
7. With a red pencil draw a line all the way from 1-10 on the filled squares.
8. Put one red mark in the square in the tens column (begin on the right.)
9. What is left in the units column is 3.
10. With a green pencil on the bottom of the unit column write "3."
11. Move to the tens column and mark 8 spaces with lead pencil and then 4 more. You will have filled one row plus 3 (because of the row of units.)
12. Then draw a line on the filled row in the tens column in red pencil and move to the hundreds column.
13. Put a mark on the first space on the right in the hundreds column.
14. On the bottom of the tens column write "3" in blue.
15. Continue for the hundreds and thousands columns.
16. Ask the child to read and write the equation.
PRESENTATION II: (MULTIPLICATION)
1. Get a problem card and copy it in the blank column. Example:
2. Explain to the child what multiplication is- adding sets.
3. Say, "We are going to add 4 sets of 3 in the units column''.
4. Cross out the row of 10 units and mark one space in red in the tens column.
5. Write "2" in green pencil at the bottom of the units column.
6. Say, "Now we are going to add 4 sets of 6 in the tens column. We will have 2 tens to carry.
7. Mark through both rows with red pencil and mark two spaces in the hundreds column.
8. Bring down the 5 and mark it in blue.
9. Continue for hundreds and thousands.
10. Have child read and write the equation and product.
CONTROL OF ERROR:
Verification of teacher.
POINTS OF INTEREST:
1. Long columns to add.
2. Exchanging.
3. Crossing off each row of ten.
4. Getting all the way to 10,000.
5. Writing the problem.
6. Making dots or slashes.
AIMS:
1. Practicing dynamic addition.
2. Visual representation of carrying.
3. Practice in writing addition problems.
AGE:
5 and up
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