Creative Problem Solving (Divisibility 1)
1. A number is divisible by another number if their quotient is a whole number and the remainder is zero.
2. For whole numbers  a, b and c, If a and b  are both divisible by c. then the sum and the difference of a and b  are each divisible by c.
3. A number is divisible by 9 if the sum of its digits is divisible by 9.
4. A number is divisible by 3 if the sum of its digits is divisible by 3.
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