Assuming the following bit layout: 
0055 5555 4444 4433 3333 2222 2211 1111

[download]
One way: 
# Get individual num:
$num = ($aggregate >> ($i*6)) & 0b111111;

# Set individual num:
$aggregate = ($aggregate & ~(0x3F << ($i*6))) | ($num << ($i*6));

[download]

Update: Added missing ~.
Update: Thelonius's newer post shows how to use this method to get/set all the nums at once.

In reply to Re: 5x6-bit values into/out of a 32-bit word by ikegami
in thread 5x6-bit values into/out of a 32-bit word by BrowserUk

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