Bead Bars: Changing the Order of the Addends

Age
4-7.

Materials

 * Tten bars
 * Colored bead bar
 * Box of signs for operations

Presentation

 * 1) The directress sets up an addition of two numbers, and the child completes the sum, placing the corresponding bead bars in their places.
 * 2) This equation is correct.
 * 3) The directress switches the places of the two colored bead bars. Is it still correct? Perhaps it was a coincidence; let's try another.

Purpose

 * To give the concept of the commutative property of addition.