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Mathematics Problem Solving

Volume 5, Number 2, September 13, 1999

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**Place
Value and Palindrome Riddles**

1. I am a
three digit number. I am less than 500. I am greater than 200. All my
digits are odd. If you take each of my three digits and add them
together, they equal 5. What number am I?

2. I am a four digit number. I have a one
in my thousands place, and a two in my hundreds place. I am a
palindrome. (A palindrome reads the same, forwards and backwards. The
words “pop” and “level” are
palindromes. The numbers “747" and “842248" are
palindromes.) What number am I?

3. I am a palindrome. I am >11
(greater than eleven) and <50 (less than fifty). I am an odd
number. What am I?

4. I am also a palindrome. I am greater
than the number of days in a year and less than the product of 19 and
20. What number am I?

5. I’m a seven digit number. Six
of my digits are zeros. I am the greatest number possible with those
characteristics. What number am I?

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