Sunday

December 21, 2014

December 21, 2014

Posted by **tyler** on Tuesday, November 8, 2011 at 7:51pm.

im a number between 300 and 400

im divisible by 3 and 4 . but not 9

my tens digit is a square number

the sum of the hundreds digit and the tens digit is a prime number.

find the mystery number

- math -
**Steve**, Wednesday, November 9, 2011 at 4:46amwe know that the number is 3xx

the tens digit is either 1,4, or 9

4+3 =7 is a prime, so the number is 34x

x cannot be 2 or 5, because 342 and 345 are divisible by 9 (cast out nines)

The number must be even, because it is divisible by 4. So, it is either

340 344 346 348 (but 4 does not divide 346)

Only 348 is divisible by 3 (cast out threes)

**Answer this Question**

**Related Questions**

math - What mystery number has 8 digits; none of the digits are the same. It is ...

math - This is a riddle, and I'm supposed to find a 5-digit number from it..... ...

MATH HELP!!!!!!! :( - This is a riddle, and I'm supposed to find a 5-digit ...

math - Using the numbers 1 through 9 with no repeats, find a 9 number such that...

math - I am a prime number. I am less than 40. I am 1 more than a multiple of 5...

math - i am a 3 digit number when i am rounded to the nearest hundred i become ...

mystery number - What is the three digit mystery number? It is less than 300. ...

4th grade math - Find the mystery number. It is a 4 digit odd number. All the ...

math - Mrs. Rossi wrote the following clus for a mystery 4-digit number. .The ...

math - find the mystery number, it is a 4 digit odd number, all the digits are ...