For the activity, I would have the child choose two number cards, placing the larger number in the space to the left. Then he or she could count out the correct number of snowflakes to place above the minuend as in the photo.As the child counts out the correct number for the subtrahend, he or she could count out and move that number of snowflakes to the area above the subtrahend. After taking away those snowflakes, the child could then count out the snowflakes left and place the number card with the difference in the last space. Continue creating and solving subtraction equations as long as the child is interested.