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what is a number that rounds to 1

USING THE DIGITS 1, 3 AND 5 WRITE A NUMBER THAT ROUNDS TO THE NUMBER GIVEN. 100 300 400 AND 500

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can you use a digit more than once as in 111 and 333 and 131 and so on.
Jan's answer look good unless you can use these as well which would give you some additional answers.
 
Cheers, kim

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1 Answer

here are all the combinations of the digits 1,3, and 5 and what they round to.
 
135 rounds down to 100
 
153 rounds up to 200
 
315 rounds down to 300
 
351 rounds up to 400
 
513 rounds down to 500
 
531 rounds down to 500