Math Memory Match

This is a car memory game with math puzzles. You dont need to predict anything to find a matching pair of reveled card.
In the board some of the cards have an arithmetic expression and others have number written on their back side. Each number is a result of given expression. Before clicking a card just solve the expression and find the other card in the deck which has same number. If both cards have same value then cards will remain opened otherwise you will lose a life out of three. Match all of the cards in the board to complete the level.