# Subtraction With Strip Board

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Subtraction With Strip Board
Math - Memory Work
LevelPrimary
Age5+

This activity gives the child practice figuring out and memorizing subtraction facts.

## Presentations

### Presentation One

1. Take the material to a mat or table. Lay out as shown.
2. The first page should have just one problem: 18-9=
Take the 9 strip and cover up the numbers starting from the end. The last visible number is the answer.
3. The next page should have two problems: 17-9= and 17-8=
Lay the shortest of the plain wooden strips over the number 18 on the board.
4. Take the 9 strip and cover up the numbers starting from the end. The last visible number is the answer.
5. Then take the 8 strip and cover up the numbers starting from the end. The last visible number is the answer.
6. next step

1. step one
2. next step
3. next step
4. next step
5. next step

## Material

This material is kind of a mess. Why can't the frame come right to the edges of the chart? Almost every kid who tries this the first time slides those strips of wood up against the frame and gets the answers all off by one.
And surely we can come up with a different system than using all those ridiculous wooden strips to cover up the numbers at the top. This is needlessly complicated.