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Name Prime and Composite Numbers Models and Examples A prime number is a number greater than one that has only two factors, itself and 1. A composite number has more than two factors. The factors of 13 are 1 and 13. 13 is a prime number. The factors of 15 are 1, 3, 5, and 15. 15 is a composite number. More Examples You can make a factor tree to find the prime factors of a number. Find the prime factors of 24. 24 2 Every even number has a factor of 2. To start factoring, divide by 2 as many times as possible. 12 2 6 2 3 The prime factors of 24 are 2 2 2 3. You can write the prime factors using exponents: 23 3 Guided Practice Write all the factors for each number. Then circle prime or composite. 7 17 prime composite 21 prime 10 prime 17 composite 23 composite prime prime composite 27 composite prime composite Make a factor tree for each number. Circle all of its prime factors. 8 © CSL Associates, Inc. (877) 790-7915 20 ARITHMETIC TO ALGEBRA IL Workbook R 17 Name Prime and Composite Numbers Practice Write all the factors for each number. Then circle prime or composite. 5 6 prime composite 11 prime 9 composite prime 14 prime composite 25 prime 19 composite prime 31 prime composite prime composite composite 33 composite prime composite Make a factor tree to find the prime factors for each number. 18 12 18 28 40 41 56 81 100 IL Workbook R ARITHMETIC TO ALGEBRA © CSL Associates, Inc. (877) 790-7915
