From the information you can generate three equations
Let the number be
My tens digit is three times my ones digit
The sum of my digits is 5
My hundreds digit and my ones digit are the same
now solve for a, b and c
I think that's too hard for him considering he's in fourth grade...
Ok, so you have three digits
___ ___ ___
They must add up to 5..
Since you know the tens digit is three times the ones digit and all of your digits must be low to add up to 5, the tens digit must be a 3. go from there.
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