3-6
Note: The difference between the number rods and the Spindle box is
There are exactly 45 spindles for the box. The child places the number of spindles associated with the numerals at the back of the box. When he reaches 9, and he finds too many or too few spindles to be placed in the compartment, then he will know that he had made a mistake and he can check his work and correct his own error.
Extension:
To give the child further practice in associating each numeral with the right situations and to reinforce the concept of zero.