Monday, 14 September 2015

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Montessori Activity: Small Bead Frame - Dynamic Subtraction (With Exchange)


Note: I am showing the large bead frame above, because it is not necessary to buy both the small bead frame and the large bead frame. I am using the large bead frame to do the small bead frame exercises.

AGE: 5.5 (after the child has worked with the Stamp Game)

OBJECTIVE(S):

To show the relationship between the different place values in the decimal system.

MATERIALS:

1. Small bead frame
2. 1 worksheet
3. 1 green, red and blue pencil

PRESENTATION:

1. Read a problem to your child, i.e.:
  4962
- 2347
---------
  2615

2. Have your child build the minuend in beads to the right of the frame, i.e. slide 2 unit green beads, 6 ten blue beads, 9 hundred red beads and 4 thousand green beads to the right.

3. Have your child try to take 7 unit beads away from 2 unit beads by sliding the green unit beads to the left and he will notice that he doesn't have enough to do so, after he has taken away 2 unit beads.

4. Tell your child, "We can exchange a ten blue bead for 10 green unit beads."

5. Slide 1 blue ten bead back to the left and move 10 green unit beads to the right.

6. Ask him to remember that he has already taken 2 units away just now, so he should continue counting from 3 and slide away 5 green unit beads back to the left to show the subtraction 12-7. There should be 5 green unit beads remaining on the right after this process.

7. Ask your child how many blue ten beads he has now and he should answer 5.

8. Have your child slide 4 blue ten beads to the left to show the subtraction 50-40.

9. Have your child slide 3 red hundred beads to the left to show the subtraction 900-300.

10. Have your child slide 2 green thousand beads to show the subtraction 4000-2000.

11. Count the remaining beads on the right of the frame and record the answer on the worksheet, i.e. 2615.

VIDEO DEMONSTRATION:



0. Prepare the materials.


1. Read a problem to your child.


2. Have your child build the minuend in beads to the right of the frame, i.e. slide 2 unit green beads, 6 ten blue beads, 9 hundred red beads and 4 thousand green beads to the right.


3. Have your child try to take 7 unit beads away from 2 unit beads by sliding the green unit beads to the left and he will notice that he doesn't have enough to do so, after he has taken away 2 unit beads.


4. Tell your child, "We can exchange a ten blue bead for 10 green unit beads."


5. Slide 1 blue ten bead back to the left and move 10 green unit beads to the right.


6. Ask him to remember that he has already taken 2 units away just now, so he should continue counting from 3 and slide away 5 green unit beads back to the left to show the subtraction 12-7. There should be 5 green unit beads remaining on the right after this process.


Have your child write 5 down on the worksheet.
7. Ask your child how many blue ten beads he has now and he should answer 5.


8. Have your child slide 4 blue ten beads to the left to show the subtraction 50-40.


Have your child write 1 down on the worksheet.


9. Have your child slide 3 red hundred beads to the left to show the subtraction 900-300.


Have your child write 6 down on the worksheet.


10. Have your child slide 2 green thousand beads to show the subtraction 4000-2000.

 

11. Count the remaining beads on the right of the frame and record the answer on the worksheet, i.e. 2615.

ADDITIONAL INFORMATION:

J tried this for the first time on 21 September 2015 (6Y6M16D). He could do the sum on paper without the small bead frame, but he had trouble understanding that he has to take away 2 first, before exchanging, when using the small bead frame.

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