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In order to find the common factors of 144 and 100, we follow the following steps:

Step 1: Find the HCF of 144 and 100.

Prime factorization of 144 = 2x2x2x2x3x3

Prime factorization of 100 = 2x2x5x5

HCF(144,100) = 2x2 = 22 = 4.

Step 2: Find the factors of HCF(144,100) i.e. 4. The factors of 4 are the common factors of 144 and 100.

Factors of 4 are 1, 2 and 4.

So, common factors of 144 and 100 are 1, 2 and 4.

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Q: What are the common factors of 74 and 100?
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