Caller picks the next image/number from the hat.  It is a heart.  

Everyone with a heart gathers together in a little group.  The caller looks on her question sheet.  The next question on the sheet is "What does 2 + 4 equal?"  

Everyone in the 'heart group' discusses the question and comes up with an answer.  If they get it right, they return to their seat and mark their square.  If they get it wrong, they return to their seat and the heart goes back in the hat (where it can be chosen again at a later time).