Bead Bars Multiplication
From wikisori
Contents
Age
6-9.
Materials
- Box containing colored bead bars 1-10, 55 of each
- Chart I (for control)
Preparation
Presentation
- We are going to represent the table of a certain number with bead bars.
- The child is invited to choose a number, i.e., 8.
- We start with 8 taken one time. One 8 bar is lain horizontally 8 x 1 = ?8.
- The product is also represented by an 8 bar (lain vertically below the first) The child writes 8 x 1 = 8.
- Now take 8 two times. The two 8 bars are lain horizontally 8 x 2 = ?16.
- A ten bar and a six bar to represent the product are lain vertically, thus making a double row,
- The child writes the equation in his notebook.
- This continues until 8 x 10 = 80.
- Observe the geometric figures which have been formed with the 8 bars: 8x1 is a line; 8x2 is a rectangle; and so on; 8x8 represents a square, etc.
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. 8x8 produced a square, which is when the number was multiplied by itself.
Purpose
Direct Aim:
- 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.
Indirect Aim:
- 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
Variation
Links
Handouts/Attachments