What is the smallest number divisible by 3, 4, 32 and 9?
You might want to try factoring these denominators and writing them in their factored form:
3, 2^2, 2^5, 3^2
Your LCD must include the following factors: 3^2 and 2^5, or 9 and 32. Multiplying these together results in the correct LCD 9*32=288.
Check: Is 288 divisible by 3? Yes. The quotient is 96.
Is 288 divisible by 4? Yes. Is 288 divisible by 32? Yes. Is 288 divisible by 9? Yes.