## Saturday 13 September 2014

### Montessori Activity: Dynamic Addition with Golden Beads - Hundred Place Value

 1. Arrange the materials according to the picture above. 2. Say, "Today we are going to learn how to add dynamic triple digit numbers together." 3. Invite your child to read the first equation or you can also read it together, for e.g. 358+566=?

AGE: 5.5 years old (after your child has tried The Bank Game and Vertical Static Addition)

OBJECTIVE: To introduce the child to dynamic triple digit addition

MATERIALS:

2. 19 ten-bars
3. 9 hundred-squares
4. 1 triple digit addition worksheet
5. 4 felt pieces
6. 1 pencil and eraser

PRESENTATION:

1. Arrange the materials according to the picture above.

2. Say, "Today we are going to learn how to add dynamic triple digit numbers together."

3. Invite your child to read the first equation or you can also read it together, for e.g. 358+566=?

4. Point to the unit place value of the first addend in the worksheet and ask, "How many units are there?" Your child should answer 8.

5. Take 8 unit beads and place it on the felt piece to the right of the worksheet.

6. Next, point to the ten place value of the first addend and ask, "How many tens are there?" Your child should answer 5 tens.

7. Take 5 ten-bars from the left felt piece and place it on the right felt piece to the left of the selected unit beads.

8.  Next, point to the hundred place value of the first addend and ask, "How many hundreds are there?" Your child should answer 3 hundreds.

9. Take 3 hundred-squares from the left felt piece and place it on the right felt piece to the left of the selected ten-bars.

10. Point to the second addend and repeat the process. Invite him to count out the unit beads, ten-bars and hundred-squares from the second addend, i.e. 6 unit beads, 6 ten-bars, 5 hundred-squares and place them on the right felt piece below the first addend's collected beads.

12. Invite your child to count the units and when he reaches the 10th unit, ask your child to exchange for 1 ten-bar, saying "10 units is the same as 1 ten-bar," and place the it with the other hundred-squares.

13. Ask your child to count the remainder units, i.e. 4 units in this case, and write the number in the unit place on the worksheet.

14. Invite your child to count the ten-bars and when he reaches the 10th ten-bar, ask your child to exchange for 1 hundred-square, saying "10 ten-bars is the same as 1 hundred-square," and place the it with the other hundred-squares.

15. Ask your child to count the remainder ten-bars, i.e. 2 ten-bars in this case, and write the number in the ten place on the worksheet.

16. Ask your child to count the hundred-squares, i.e. 9 hundred-squares in this case, and write the number on the hundred place on the worksheet.

18. Invite your child to try with the next equation.

VARIATIONS:

1. Other materials can be substituted for the color bead stairs, such as buttons, counters, etc..
2. Try with vertical presentation of the equation.

REFERENCES:

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 4. Point to the unit place value of the first addend in the worksheet and ask, "How many units are there?" Your child should answer 8. 5. Take 8 unit beads and place it on the felt piece to the right of the worksheet.

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 6. Next, point to the ten place value of the first addend and ask, "How many tens are there?" Your child should answer 5 tens. 7. Take 5 ten-bars from the left felt piece and place it on the right felt piece to the left of the selected unit beads.

 8.  Next, point to the hundred place value of the first addend and ask, "How many hundreds are there?" Your child should answer 3 hundreds. 9. Take 3 hundred-squares from the left felt piece and place it on the right felt piece to the left of the selected ten-bars.

 10. Point to the second addend and repeat the process. Invite him to count out the unit beads, ten-bars and hundred-squares from the second addend, i.e. 6 unit beads, 6 ten-bars, 5 hundred-squares and place them on the right felt piece below the first addend's collected beads.

 12. Invite your child to count the units and when he reaches the 10th unit, ask your child to exchange for 1 ten-bar, saying "10 units is the same as 1 ten-bar," and place the it with the other hundred-squares.

 13. Ask your child to count the remainder units, i.e. 4 units in this case, and write the number in the unit place on the worksheet.

 14. Invite your child to count the ten-bars and when he reaches the 10th ten-bar, ask your child to exchange for 1 hundred-square, saying "10 ten-bars is the same as 1 hundred-square," and place the it with the other hundred-squares.

 15. Ask your child to count the remainder ten-bars, i.e. 2 ten-bars in this case, and write the number in the ten place on the worksheet.

 16. Ask your child to count the hundred-squares, i.e. 9 hundred-squares in this case, and write the number on the hundred place on the worksheet. 17. Read out the question and answer together, for e.g. 358+566=924. If you haven't written the answer, do it now.