Addition With Bead Bars

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Addition With Bead Bars
Math - Memory Work
Add with Bead Bars 8.JPG
Level Primary
Age 4 - 5
Prerequisites Addition With Number Rods

This activity teaches the child...

Presentations

Sums up to 10

  1. Set up three bead bars as shown, two with five bead bars, one with ten.
    "Today we're going to do addition with bead bars."
    Add with Bead Bars 1.JPG
  2. Move the 2 bead bar down from the first bead stair.
    Add with Bead Bars 2.JPG
  3. Move down the 1 bead bar from the second bead stair.
    Add with Bead Bars 3.JPG
  4. Count the combined bead bars.
    Add with Bead Bars 4.JPG
  5. Move down the 3 bead bar for the answer from the third bead stair. Compare it with the 1 and 2.
    Add with Bead Bars 5.JPG
  6. Lay out the bead bars with the symbols in between.
    Add with Bead Bars 6.JPG
  7. Do some other +1 equations to make sure the child gets the idea.
    Add with Bead Bars 7.JPG Add with Bead Bars 8.JPG

Sums greater than 10

  1. Set up three bead stairs, two with nine bead bars, one with ten.
    Add with Bead Bars 9.JPG
  2. Move down one of the longer bead bars from the first bead stair, then a longer bead bar from the second bead stair. Place them end to end.
    Add with Bead Bars 10.JPG
  3. Count the total beads and lay out the answer from the third bead stair consisting of a ten bar and the appropriate smaller bead bar.
    Add with Bead Bars 11.JPG
  4. Lay out the bead bars with the symbols in between.
    Add with Bead Bars 12.JPG

Points of Interest

Control of Error

Variations and Extensions

Material

Mortensen Blocks

I've found that this activity works much better using Mortensen Math blocks rather than the traditional bead bars. At the very least, it would be better to use bead bars that are fused together and do not have the little wire loops sticking out at the ends.
For example, to show that 2+1=3 it is much easier to see the equivalence with the blocks than with the bead bars:
Add with Bead Bars 5.JPG Mortensen Addition with Bead Bars 1-5.JPG
The improvement is even more apparent with larger sums:
Add with Bead Bars 11b.JPG Mortensen Addition with Bead Bars 2-5.JPG
The child doesn't need to count to see that the two addends together are the same as the answer, it can be plainly seen.

Sums Less than 10

The procedure for doing addition with sums less than ten is the same with the blocks as with the bead bars:
Mortensen Addition with Bead Bars 1-1.JPG Mortensen Addition with Bead Bars 1-2.JPG Mortensen Addition with Bead Bars 1-3.JPG Mortensen Addition with Bead Bars 1-4.JPG Mortensen Addition with Bead Bars 1-5.JPG Mortensen Addition with Bead Bars 1-6.JPG

Sums Greater than 10

The procedure for doing addition with sums greater than 10 is similar but with one important difference.

  1. Set up the material in the same way as with the bead bars.
    Mortensen Addition with Bead Bars 2-1.JPG
  2. After you have laid out the two addends end to end, count only up to ten, then stop. Get the 10 block and lay it beneath the addends.
    Mortensen Addition with Bead Bars 2-2.JPG Mortensen Addition with Bead Bars 2-3.JPG
  3. Count the remaining blocks that stick out past the 10. Find the block that fills the remaining space.
    Mortensen Addition with Bead Bars 2-4.JPG Mortensen Addition with Bead Bars 2-5.JPG
  4. Lay out the blocks with the symbols in between.
    Mortensen Addition with Bead Bars 2-6.JPG