Wrote numerals 1-20 on foam dots and glued a numbered dot to each car. Using a wooden board, we divided it into 20 parking spaces and attached a piece of velcro onto each space. Once the children finish playing with the cars, they place the cars back in the parking spaces in the correct order. Great activity for small group or to work one on one with a child who needs support in this area. Could make it a game for small group.