Bead Bars Multiplication: By Ten

Age
6-9.

Materials

 * Box of colored bead bars 1-10
 * Chart I
 * Small white strips of pape
 * Black pen

Presentation

 * 1) The child is invited to take 10 bars of any color he wants.
 * 2) Lay them in a column, skip counting as you go.
 * 3) When he is finished and has found the total, lay out the corresponding number of 10 bars vertically in a row beneath the column (note the resulting rectangles should be congruent).
 * 4) The number we took was 4 (place a label for 4 beneath the row of beads), 10 times. The result was 40.
 * 5) Directress asks the child; "How do we write 40? The 4 will now indicate tens, and we put a zero for the units". Place a 0 label next to the 4 to make 40.
 * 6) Repeat this with other numbers until the child realizes by himself that when you multiply a number by 10, the product will be the multiplicand with a zero tacked on in the units place.

Purpose

 * To help the child with the memorization of multiplication.
 * To help the child with the independent realization of the fact stated previously: n x 10 = n0.