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2.1 OperationsOrder of operationsOpen theory →2.2 HCF and LCMFactors, prime numbers and multiplesOpen theory →2.3 FractionsAdding, subtracting and multiplying fractionsOpen theory →2.4 Negative NumbersWorking with negative numbersOpen theory →2.5 Multiplying and Dividing Negative NumbersSigns and order of operationsOpen theory →2.6 Negative FractionsCalculations with negative fractionsOpen theory →