Explanation of what you did to solve the problem is good but you may have only explained one strategy. You may have included diagrams, charts, lists or graphs, however, they may be incomplete or unlabeled. You may not have explained enough detail to satisfy the requirement. Explanation is weak. Strategy used may be unexplained.
Little effort is shown.
Explanation is poor. Little or no effort is shown. The solution is appropriate, and all mathematical work is shown. Your reasons that you feel the solution is correct are carefully explained. The solution may be correct or incorrect, however, you do not give reasons you believe it is correct, or your solution is incorrect and unsupported.