GAMES AND EXPLORATION USING BEAD BARS
b. The Snake Game
Control of Error: As before, the child controls his work by matching. The ten bars and reminder bead bar (if any) are grouped together to one side. The colored bead bars from this snake are arranged in hierarchic order. the large box of colored bead bars is reopened, in case exchanges are necessary. The child takes a ten bar and a colored bead bar, i.e. 8. What must be added to eight to make ten? A colored bead bar of two is united with the 8 and placed next to the ten. If the child doesn’t have a bead bar of two, an exchange must be made. Combinations of two numbers to make ten should always be used when controlling. The child sees that his addition was exact when the colored beads are all matched to ten bars (and the black reminder bar).
…reminder beads usually black and white
…colored bead bars
…Addition Chart I
The reminder beads are lain out in a triangle arrangement to facilitate movement. The child is asked to make a snake with the colored bead bars. (The box is then covered again) The child no longer counts bead by bead to arrive at the ten. The first two beads are isolated. The child mentally computes the sum, i.e. 8+9=17. We can replace these with a ten (the ten bar is lain out) and seven (the reminder bead bar connects the ten to the rest of the snake). The 8 and 9 are put into the empty box. Go on adding the seven reminder bar to the next bar of the snake. These are isolated, added, the ten bar and corresponding reminder bar replace them in the snake, and the colored bead bar is returned to the empty box while the first reminder bead bar is replaced in its place in the triangle.
The child may make combinations of more than two bead bars, keeping the sum less than 19. If the child does not remember a combination, he may use the Addition Chart I. Command cards may be made.