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283 rounded of to the nearest tens is 280 and when rounded to the nearest hundreds is 300.
300
283 x 1 = 283
1, 283 (283 is a prime number).
You didn't mention whether we're allowed to repeat (re-use) a digit.Here are the smallest 5 primes using only those digits:With repeated digit: 223, 233, 277With no repeated digit: 257, 283