I counted all the cubes and listed 0-5 on my card. If I had 20 cubes for example.... usually the shape will take up 3 questions, so I would mark down what I thought, of 1 side 3 side etc. Then I would go back and check to see if everything added up to 20 cubes. This method saved me from 2 questions for sure. One of the question I had counted 7 3 sides, but I was 1 short of my 20, sure enough there were 8.