A large mat
A large square board
A box with:
- 10 squares increasing in size from 1cm x 1cm to 10cm to 10cm, in plastic (or cardboard).
- Each square has corresponding rectangles, except for the square 1cm x 1cm.
- Each square and its corresponding rectangles are of a different color.
Invite a child and have him unroll a large mat. Bring him to the shelf and show him the box we will be using. Tell the child that today we will be working with the Sensorial Decanomial. Have him bring the box to the mat and have him place the box in the upper left hand corner. Have the child sit near the left side of the mat and you sit to the child’s right.
The child works individually as in the way shown during the presentation.
Have the child build using all of the squares and rectangles as shown in the presentation. Remove one band of color (usually the 6th or 7th row: the purple or white rows). Place them onto the mat and move the other rectangles or squares up, and removing any unneeded rectangles onto the mat.
Have the child build as in the first presentation. Then remove one of the bands, as is Exercise 2. Using the unneeded rectangles and square, build as may squares as possible.
Have the child build as in the first presentation. Take out one of the larger squares (either coming from the 9th or 10th row). Place it on the mat. Take out a smaller square and place it in the top left corner of the large square. Explore by taking out other squares or rectangles needed to complete or fill in the square. Once that is done, slide off this “newly made square” and try creating another large square made up of smaller squares and triangles.