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User Manual Discussion points Which blocks are the most difficult to place? Which of the 3 walls do you think is the most difficult to build and why? This wall provides an excellent opportunity for a general open ended discussion about equivalence. A question bank for this task may be added at a later date. Suggestions for now include: Which 2 fractions add up to three quarters? Which 2 fractions add up to three fifths? Which 3 fractions add up to one? These can be made easier by using percentages instead of fractions. 15