15 only has 4.
1,3,5 and 15
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First add 15 and 45. Then find the factors. 15+45=60 The factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, and 30.
Factors of 15 are 1, 3, 5, and 15. Factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30. Common factors of 15 and 30 are 1, 3, 5, and 15.
The answer to this is 3
There are no common factors of 15 because there cannot be common factors without two or more numbers to compare. Common factors are factors that the numbers being compared have in common.The factors of 15 are 1, 3, 5, and 15.Examples:The common factors of 6 and 15 are 1 and 3.The common factors of 15 and 90 are 1, 3, 5, and 15.1,5,3, and 15.
The odd factors of 90 are 1,3,5,9 and 15.