Bead Bars Multiplication
- Box containing colored bead bars 1-10, 55 of each
- Chart I (for control)
1. We are going to represent the table of a certain number with bead bars.
2. The child is invited to choose a number, e.g., 8.
3. We start with 8 taken one time. One 8 bar is laid horizontally 8 x 1 = ?
4. The product is also represented by one 8 bar (laid vertically below the first) The child writes 8 x 1 = 8.
5. Now take 8 two times. The two 8 bars are laid horizontally 8 x 2 = ?
6. A ten bar and a six bar to represent the product are laid vertically, thus making a double row.
7. The child writes the equation in his notebook. 8 x 2 = 16
8. This continues until 8 x 10 = 80.
9. Observe the geometric figures which have been formed with the 8 bars:
and so on...
Control Of Error
Points Of Interest
Notice the rectangles that come before the square have a base longer than the height.
The rectangles that come after the square have a base which is shorter than the height.
- To help the child with the memorization of the multiplication tables.
- To bring the child to awareness of the functions of the multiplier and the multiplicand.
- To understand that a number when multiplied by ten results in the same number of tens and zero units.
- To realize that a number multiplied by itself results in a square to give the concept of forming surfaces, starting with a line, progressing to rectangles