Montessori Small Wooden Number Cards with Box (0-9000) by Callie's Corner The number cards consist of wooden number symbols 1-9000. Thousands in green, hundreds in red, tens in blue and units in green. Set includes a partitoned wooden box Box Size : 10.5 x 10 x 2 cm The Number Cards give the child a concrete understanding of units, tens, hundreds and thousands. They can be used along with the Golden Beads to learn addition, subtraction, multiplication, and division of the thousands.