## Monday 14 September 2015

### 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:

2. 1 worksheet
3. 1 green, red and blue pencil

PRESENTATION:

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.

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.

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.

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.

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.

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.