Using the Addition Strip Board the child practices the sequence of addition combinations 1-9 and begins the process of memorization of the addition tables. The material is composed of a chart in a beech wood frame. the chart has 12 squares by 18 squares with the numbers 1-18 printed across the top. Stored in a hardwood box are the strips used for the exercise nine red strips divided into squares and nine solid blue strips both printed with the numerals 1-9.