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N1. Numbers and their operations
1.2. Finding highest common factor (HCF) and lowest common multiple (LCM), squares, cubes, square roots and cube roots by prime factorisation 3 Quizzes
1.7. Approximation and estimation (including rounding off numbers to a required number of decimal places or significant figures, and estimating the results of computation) 2 Quizzes
N2. Ratio and proportion
3.4. Increasing/decreasing a quantity by a given percentage (including concept of percentage point) 2 Quizzes