To identify prime and composite numbers, circle the prime numbers and cross out the composite numbers in each set.
For the first set, {2, 3, 9, 10, 11, 17, 19}, the prime numbers are 2, 3, 11, 17, and 19. The composite numbers are 9 and 10.
For the second set, {1, 4, 5, 7, 10, 13, 15}, the prime numbers are 5, 7, 13, and the composite numbers are 1, 4, 10, and 15.
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