These are the questions that carry the marks in Paper 2, and they come in a few shapes worth recognising. In a remainder chain, each fraction is taken from what is LEFT, not from the original. In a transfer, things move between two people but the total never changes. In an unchanged-quantity problem, one group stays fixed while the other shrinks, so anchor your units on the group that does not move. Draw the bar model before you calculate — the model is the method.
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