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Prime and composite

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Which are prime and which are composite? 18, 22, 31

composite: 18, 22 prime: 31

Which are prime and which are composite? 17, 7, 24

Composite: 24 prime: 7, 17

Draw an array model to prove this number is prime or composite: 9

Composite: 1 x 9 3 x 3

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