Here's some websites for you to practice the balancing of equations.
You get to check if you have gotten it right immediately.
Notes and Exercise: http://richardbowles.tripod.com/chemistry/balance.htm
Exercise: http://funbasedlearning.com/chemistry/chemBalancer3/default.htm
Exercise: http://www.chem.vt.edu/RVGS/ACT/notes/scripts/bal_eq1.html

Picture from Edventure.com
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