" Math Memory- Addition and subtraction" aims at to practice and reinforce the knowledge of addition and subtraction concepts with the help of various matching activities and games suggested in the given Activity Guide. With the help of 60 large sturdy Problem and Solution cards the child/children will match: 1. Addison ‘Problem Cards’ with their corresponding ‘Answer Cards’. 2. Match Subtraction ‘Problem Cards’ with their corresponding ‘Answer Cards’. 3. Match equivalent sum cards. 4. Match the cards that express the same value and 5. Play Concentration game.