4.RA.B.5
Determine if a whole number within 100 is composite or prime, and find all factor pairs for whole numbers within 100.
Khan Academy ResourcesPrime and composite numbers reviewFactors and multiplesPrime and composite numbers introIdentify prime numbersIdentify composite numbersIdentify factorsRelate factors and multiplesPrime and composite numbersMultiply 2-digit numbers with area modelsFactor pairsRecognizing prime and composite numbersFinding factors of a numberPrime numbersUnderstanding factor pairsFactors and multiples: days of the weekReasoning about factors and multiplesFinding factors and multiples

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