This is one of my favorite ways to receive guidance from Baba, and it is very simple. I have received so many miracles from doing this and following the answer.

 

Close your eyes and visualize Baba's face or form, and ask him for a number (1-720). Be silent, keep his form in your mind, and a number will bubble up. Next, click this link and type it in to see what he wants you to know:
 

In addition to asking for a number, sometimes I'll see a number - on a clock, license plate, house address, etc. I'll have a distinct feeling that I'm supposed to look it up, or in some cases, a loud noise will go off when I see a number indicating it's a message for me.

 

I always confirm with Baba by visualizing him and asking for a confirmation. 

He may make a noise, your ears may start ringing, an animal may dart across your vision....be observant and patient.

Here is 'Ask Sai Baba' app I like for when I'm not at the computer:

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Additionally, here is one more site that gives longer answers. Occasionally I am called to look at it instead of the other one, something you'll know if its right for you:

The key to benefiting from this practice is to trust fully that the answer you receive is meant for you, and to follow through with any guidance he gives. As I have  mentioned, I have experienced miracles and incredibly timely and relevant messages to current circumstances in my life. 

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Enjoy!