This is a fun way to work on finding the missing addend using these cute playdough mats. Print the mats and laminate. Provide purple playdough so the children can create spots. The children will look at the equation, the first number is the green spots already on the ladybug. The children will build up to the sum using their purple spots. The number of purple spots is the missing addend. After they have their answer the children will write the equation on a recording sheet. Numbers used in this unit are 1-10.