Question

Find the three digit number that satisfies the following conditions:
. Has a factor of 3.
. Has a factor of 5.
. Has a factor of 7.
. All digits are prime.

Describe the thinking process you went through to solve this problem.
Ms. Sue
3 * 5 * 7 = ?

Ms. Sue
I forgot that 0 is not prime.

However, 525 meets the criteria
Ms. Sue
735 also works.
so does 315

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