Balancing Equations Foldable

I created this balancing equations foldable for my physical science classes. We began our chemical reactions unit in physical science by balancing chemical equations.  

When I took chemistry in high school, I ADORED balancing equations.  Each problem was like a mini-puzzle.  And, I love puzzles!

I put a circle in front of each reactant and product to show students where to write their coefficients.  Circles turned out to be a bad idea for this because some of my students mistook them for zeros.  I guess I should use rectangles in the future.