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This section presents the Decimal Comparison Test, a 30 item test taking only 10 minutes for a class, which provides a deep insight into how individual students interpret decimal notation. Students can then be matched up with the case studies to identify appropriate teaching activities.

Seven other tests are also given - two for further identification of decimal misconceptions and five tests of basic skills. Many other difficulties with decimal arithmetic stem from misunderstanding the meaning of decimal notation, so it is important to teach it well.