60, 72, 84, 90, and 96 each have 12 factors.
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4, 9, 25, and 49 are all of the numbers between 1 and 100 having 3 factors.
Both 25 and 4 are factors of 100 and are square numbers, 25 is 52 and 4 is 22. 100 and 1 are also factors of 100, and are also square numbers: 1 is 12 and 100 is 102.
These numbers, known as the common factors of 24 and 100, are:1, 2 and 4.
The general factors of the two numbers are as follows :- 99 : 99, 33, 11, 9, 3, and 1 100 : 100, 50, 25, 20, 10, 5, 4, 2 and 1 If the question is what two numbers divide into both 99 and 100, then by general usage the factors of numbers are usually presented showing just the positive numbered factors but they should also include their negative equivalents. As the only common factor of 99 and 100 is 1 then the two numbers that can divide both 99 and 100 are 1 and -1. Note : It is presumed that the answer is required in integers.
The common factors of 64 and 100 are 1, 2, 4, and 8 .