This set of essential equations is for all four operations. This includes one slip for each basic equation from 1+1 to 9+9, 1-1 to 18-9, 1x1 to 10x10, and 1÷1 to 81÷9. Essential equations are based off of the full control charts for each operation provided by Nienhuis Montessori. Each slip measures approximately 1 inch by 2 inches. The colored border correlates with traditional Montessori equation colors. These are best printed on cardstock, cut, and laminated. YOU WILL RECEIVE: • One printable