Difference between revisions of "Bead Bars Multiplication"

Revision as of 20:00, 19 July 2009

Age

6-9.

Materials

• Box containing colored bead bars 1-10, 55 of each
• Chart I (for control)
  

Preparation

Presentation

1. We are going to represent the table of a certain number with bead bars.
2. The child is invited to choose a number, i.e., 8.
3. We start with 8 taken one time. One 8 bar is lain horizontally 8 x 1 = ?8.
4. The product is also represented by an 8 bar (lain vertically below the first) The child writes 8 x 1 = 8.
5. Now take 8 two times. The two 8 bars are lain horizontally 8 x 2 = ?16.
6. A ten bar and a six bar to represent the product are lain vertically, thus making a double row,
7. The child writes the equation in his notebook.
8. This continues until 8 x 10 = 80.
9. 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